Often used when playing The Dozens. The classic example begins "Yo' momma so fat, [insert fat joke here]."
"Your mother wears army boots!" The implication is that she must have got them by bartering sex with a soldier for clothes. This particular one, referring to women in poor villages who would put out in such a fashion, has become a Dead Horse Trope. Especially since a woman who wears army boots is probably in the army.
A Spear Counterpart is the classic "So's your old man!", which was popular in the early twentieth century but has fallen out of use nowadays.
For characters in the correct age demographic, substitute "Your wife."
If one feels the need to elaborate, there's this version from the '80s: "Your mom. Your dad. Your bald-headed grandma."
Dragon Ball Z: Goku, when attempting to get Uub (who was suffering from a massive dose of ring fright before his match with Goku) to fight by making him mad by insulting his family, says "Hey, yo mamma's so fat, cows moo at her!"
The Japanese version has Gohan shout this at Nappa, similar to the Paper Mario example below (complete with the "How did he know about Mom's outie?" response).
Canaan does this with Mino and Santana's mud-slinging match in the 5th episode, which eventually devolves into this sort of thing.
"Yo, why are they fighting?" "They're claiming first dibs." "On what?" "Your mom, of course." "... He's lucky I just took three Percocets."
Issue 611 of ''Amazing Spider-Man'' sees a Let's You and Him Fight between Spider-Man and Deadpool degenerate into a gladiatorial battle of "Yo Momma" jokes (as in, they end up just standing in the middle of a basketball court firing zingers off at each other). After being pushed just too far by Spidey, Deadpool prepares to break out "Yo Mommageddon", a 'Yo Momma' crack he's honed so perfectly that it causes people to cry themselves to death (although in Hebrew it only makes people bite their own tongues off, as Deadpool learnt when he sold it to Mossad). He's just about to break it out when his beeper goes off, revealing that he's done for the day. He then cheerfully offers to buy Spidey a beer.
One of the kids who were watching the "fight" calls Deadpool out on it, claiming Deadpool was bluffing about the "Yo Mommageddon". Deadpool whispers HALF of the joke in the kid's ear, and he immediately starts crying.
In Ultimate Spider-Man, Spidey is fighting crime in a half-completed, bargain-basement version of his normal costume (the original was destroyed, and he didn't have a handy replacement.) He breaks up a mugging, and one of the crooks asked where his real uniform was. Spidey retorts, "Your mom's washing it for me." While beating them up, he admits that jokes like that are usually beneath him, but he's not exactly on his A-game.
Dogbert's Clues for the Clueless, Dogbert explains that, while insulting somebody's mother is impolite, "fathers are fair game." He illustrates this by rattling off a bunch of "your father is so dumb" jokes.
In ABC Warriors, during the Volgan War, Ro-Jaws provoked Mek-Quake into attacking him (thus saving the other Warriors) with a string of "Your mother" jokes. Blackblood tries to persuade Mek-Quake that, since they're all robots, none of them have mothers. It doesn't work. The greatest moment has to be this exchange:
Mek-Quake:(chasing Ro-Jaws) I will do unspeakable things to you! Ro-Jaws:(running away) Last night I did unspeakable things to your mother!
In Scott Pilgrim, during Scott's fight with Matt Patel, Ramona's First Evil Ex-Boyfriend, Scott tries to rattle Matt by asking about the time Matt and Ramona dated.
Scott: C'mon, man, dish! Got any embarrassing stories?
Matt: Y-your mom is an embarrassing story!
High School Flashback - The evil Benvi Tech boys kidnaps Kim P.
Scott goes to rescue her. Final Boss is Simon Lee.
Simon Lee: So, this is the best St. Joel can muster?
Scott: That's not what your mother said last night!
The Half a Life arc of Gotham Central revolved around the involuntary outing of Renee Montoya, who has already had to deal with being a Hispanic woman in the predominantly white male Gotham City Police Department. When it is revealed that she is also gay a lot of the other GCPD detectives, who dislike her and the Major Crimes Unit as a whole because of their basic honesty in the highly corrupt police force, begin insulting her even more. Renee, however, has never been one to just take the abuse when other people decide to dish it out.
Detective Lowe: You're probably in a hurry to get home to your little lady or whatever you call her, huh? The night time is the right time for love and all that, right? Detective Montoya: That's what your mother tells me. Detecive Lowe:...Dyke.
Nightmare Moon: Is this how thou treat all visiting royalty? With threats of violence thou cannot hope to fulfill? Or was thy mother too busy whoring herself to teach thee proper manners?
Rainbow Dash: Congratulations. That was the worst yo mama joke I've ever heard.
There's a Glee fanfic in which Puck, in accordance with his canon persona, tries to get a rise out of Kurt by claiming to have had sex with his mother. Kurt leaves, visibly upset, and Puck finds out from Finn that Kurt's mother is dead. Ouch.
A Future of Friendship, A History of Hate: In Episode 2, Spike does this to distract a bunch of shadow wraith possessed guards in order to allow Twilight a chance to sneak into the castle. They're mostly confused, but chase him anyway.
Spike: Your mothers were a bunch of three-legged mule chasers! (blows a raspberry)
Dawn: Your mother sucks jelly babies in hell! Jennifer: No she does not! Dawn: All right... Your mother's a Biology teacher in Cheshire!
And by Ozzy Osbourne in a backmasked message in his song "Bloodbath in Hell," where he says "Your mother sells whelks in Hull." This is also a Take That against a lawsuit he had received for an Urban Legend of Zelda regarding an allegedly backmasked message in his album Blizzard of Ozz.
Ellerby: Go fuck yourself. Dignam: I'm tired from fucking your wife. Ellerby: How is your mother? Dignam: Good, she's tired from fucking my father.
From Ghostbusters, when Walter Peck tries to have the 'Busters arrested:
Peck:HOLD IT! I want this man arrested! Captain, these men are in criminal violation of the Environmental Protection Act, and this explosion is a direct result of it! Egon: YOUR MOTHER... (The rest of what Egon says dissolves into a fist-fight and a rare moment where he expresses actual emotion. It's assumed he said something to the tune of "Your mother's a violation of the EPA")
Major League - Catcher Jake Taylor gets a batter to pop up for a game-ending out with a little impromptu trash-talking along these lines.
Taylor: By the way, saw your wife last night, hell of a dancer, you must be very, very proud. I mean that guy she was with, I'm sure he's a close personal friend and all. But tell me, what was he doing wearing her panties on his head? (Batter Pops Up) Uh-oh, that's it, I don't think this one's got the distance.
Guy: Would that I had known you when you were still capable of making bastards. Godfrey: I knew your mother when she was making hers. Fortunately, you're too old to be one of mine.
Remember the Titans has a scene where the black players are telling Yo' Momma jokes about the white guys in the locker room, and the white guys take offense until one of them joins in, whereupon it's revealed that it's a form of bonding.
Detective Traxler: Well, how do I look? Detective Vukovich: Like you've been dead for a week. Detective Traxler: Yo mama.
In The Waterboy, during a football game, Bobby Boucher wishes an opposing player good luck before the next play, but that player rudely replies "I'll be playing with your mama tonight", making Bobby ominously mutter "62", his jersey number. During the play, Bobby intercepts the ball, but idiotically gives it back to that player, who takes it for a touchdown to beat Bobby's team. Though Bobby roughhouses him anyway.
Parodied in the first Scary Movie. Brenda berates her brother Shorty, and he calls her mother stupid. She points out that he just insulted his own mother, as they're full siblings. Then he insults her father, and she doesn't mind because she never met the guy, and as he realizes, neither has he.
Ender’s Game: Bean delivers an awesome zinger of this type at Bernard when asked how he got such good test scores.
Bernard: They probably cheated.
Bean: Your mom cheated; that's why you look like a plumber.
Wild Bill Wharton in The Green Mile tries a "your wife" variety on a prison guard... who isn't married. He comes back that it was probably Wharton's sister he was thinkin' of.
In Stephen King's novella, The Body, there are several Your Mom insults, such as "Your mother blows dead rats!" Also, when Chris holds Ace at gunpoint:
Chris: Oh, why don't you go home and fuck your mother some more? I hear she loves the way you do it. Ace:. I'll kill you for that. Nobody ranks my mother. Chris: I heard your mother fucks for bucks. In fact, I heard she throws blowjobs for jukebox nickels. I heard -(interrupted by thunder)
Note that earlier, when one boy says something critical about his friend's father, this is considered a serious breach of etiquette, whereas taunts about mothers are understood to be kidding.
Happens in Thomas Pynchon'sAgainst The Day when Archduke Franz Ferdinand of Austria visits a black neighborhood in Chicago in the 1890s.
"Something about...your...wait...deine Mutti, as you would say, your...your mamma, she plays third base for the Chicago White Stockings, nicht wahr? A quite unappealing woman, indeed she is so fat, that to get from her tits to her ass, one has to take the 'El'! Tried once to get into the Exposition, they say, no, no, lady, this is the World's Fair, not the World's Ugly!" "Um, Your Royal Highness? If we could just have a word—" "It is all right! I know how to talk to these people! I have studied their culture!"
Invoked by Butler in the first Artemis Fowl book, where he uses a mother insult to lure some dockworkers out.
In the Star Trek Expanded Universe novel I, Q, the war between the Q Continuum and the M Continuum started when one of the M, after a discussion of why there needed to be a war which nobody could get worked up about, suddenly said "Your mother!"
Made even more hilarious by the fact that, since both the Q and the M are omnipotent, immortal beings, none of them actually had mothers!
In Jessica Layne's Knight Moves, a Middle Ages knight is challenged by stereotypical black Philadelphia gangsters to a "Yo Mama" contest.
Harry Potter uses it against Malfoy in Harry Potter and the Goblet of Fire, after Malfoy insults Ron's mother. "You know your mother, Malfoy? That expression she's got, like she's got dung under her nose? Has she always looked like that, or was it just because you were with her?"
Marge throws one in Harry's direction early on in Prisoner of Azkaban. It doesn't end well, and Harry himself is struck with guilt until Cornelius Fudge tells him that was OK due to the circumstances going on at the time (specifically, an escaped alleged murderer/magic user on the loose in Mother England).
In Nanny Ogg's Cookbook, we're told that in some troll dialects, which rely a lot on guesture, extending one's hand to a troll is "a very bad remark about his mother". Apparently, it was some time before humans and trolls worked this miscommunication out.
In The Wise Man's Fear, an ordinary mercenary attempts to pick a fight with Adem mercenary Tempi by suggesting that Tempi's mother was a whore. This falls rather flat as A: Tempi is unfamiliar with the Aturan word for "whore" and B: Ademic culture does not have a stigma against prostitution.
Once he's been made to understand what the other man said, he thanks him for speaking so kindly about his mother.
This is the insult that sparks the whole plotline in Scaramouche.
Kirk: "What can you expect from a simpering, devil-eared freak whose father was a computer and his mother an encyclopedia."
In the Star Trek: The Next Generation episode The Samaritan Snare, Captain Picard tells the story of how he came to need an artificial heart, by unwisely insulting a group of Nausicans. His recounting of the events included one of these directed at the most fearsome of his opponents—though, Picard being Picard, it's couched in the classiest terms possible:
Picard: I stood toe-to-toe with the worst of the three, and told him what I thought of him, his pals, his planet, and I possibly made some passing reference to his questionable parentage...
Trebek: This is the sound a doggy makes. Sean Connery: Moo. Trebek: That is incorrect. Sean Connery: Well that's the sound your mother made last night! Trebek: ...We would have accepted "bow wow" or "ruff". Sean Connery: Ah, rough! Just the way your mother likes it, Trebek!
Sean Connery: It's been a long time Trebek. Trebek: Not long enough. Sean Connery: That's not what your mother said last night!
Tom Hanks: (hand is stuck in a pickle jar) But I want a pickle. Trebek: But we can't keep playing unless you let go of the pickle. Sean Connery: That's what your mother said last night!
Also played with in the "Mother joke of the day" on the Talk Show parody I'm Chillin.
Jeopardy! itself had a category called "Your Momma!" on 12/16/2010, which brought laughter the first time a contestant picked it. The exact wording didn't help...
Contestant: Alex, I'll take "Your Momma!" for $400.
Bud and Kelly will often insult each other with barbs along the lines of "Eat Mom's cooking/Smell Dad's shoes". And have no problems saying it in front of their parents.
A recurring sketch on In Living Color! had a Game Show called "The Dirty Dozens," in which the host would supply the first part of the insult, and the contestants would ring in to finish it. For example:
Host: (deadpan) "Yo mama so hairy..." ("T-Dogg" buzzes in) Host: T-Dogg "T-Dogg": Yo mama so hairy, Bigfoot be takin' pictures of her.
Subverted when some of the categories don't lend themselves well to the joke: i.e. "Yo' momma so good at math ..."
The dirty dozens are Serious Business for Mo and Marcus of Smart Guy, who treat it like a martial art, even bowing before and after a match. Hilarity Ensues when they attempt to instruct Marcus' little brother TJ, the titular smart guy as a method of countering a bully who is mocking his ear size after his attempt at ignoring the bully failed outright. Although it was initially successful, it ended up backfiring on him when one of TJ's "Yo Momma" jokes (well, technically "Yo daddy", but still), "Hey, yo dad's so ugly that he ended up arrested for mooning", turned out not only to be very much true, but was also the bully's Berserk Button, as apparently he has to become the man of his household to fill in the void of the father's jailtime, the stress relating to it and craving for attention as a result acting as the very reason why he often has to bully others.
In "The Vampires of Venice", Rory, attempting to draw the Monster of the Week away from Amy, tells it "The only thing I've seen uglier than you is your mum!". The monster's reaction cues an Oh Crap look.
Kind of subverted in "The Girl in the Fireplace". When the Doctor (who is probably drunk) confronts the clockwork robots, he says "You're Mr Thick Thickity Thick-Face from Thick Town, Thickainia... and so's your dad."
"The Runaway Bride": Donna and the Doctor are stuck in the middle of nowhere, and are trying to take a cab back to the church. Eventually they realize neither of them has any money. The cabbie dumps them out and all we hear is Donna scream, "And that goes double for your mother!"
Gene: Serves you right for staying up all night rutting with that new fella of yours. D'you let his guide dog watch? Phyllis: His guide dog's giving your mam one. From behind. (Sam smirks) Gene(to Sam): Whatever 'appened to all the classy birds?
In the Stargate SG-1 fifth season episode "Fail Safe", O'Neill and Jackson recount how a particular negotiation with the Asgard went south:
O'Neill: ...And after that, I kind of lost my temper. Hammond: What exactly does that mean? Jackson: Let's just say Jack made a reference to Freyr's mother.
In The Big Bang Theory, Sheldon gets in on the Yo Mama action several times, it's used against him as well.
When attempting to trash talk before a bowling match
"You bowl like your mother, unless she's a competent bowler, in which case you bowl nothing like her."
Trash talking before a Robot Wars style battle
"Also, I'm given to understand that your mother is overweight. Now of course if that is a result of a glandular condition and not sloth and gluttony, I withdraw that comment."
In S6 E20, Sheldon took the Yo Mama jokes to a new level (for him), saying he banged Raj's mom. This from an asexual virgin.
When the guys fought for a ring from the production of The Lord of the Rings, they tried to get Sheldon down by talking about his mom's sex life. He seemed to be taking it reasonably well, so the guys stepped up and reminded him that his mee-maw had sex to have his mother, but not only that. They bet she also liked it.
Kid: Yes, Ms. Zbornak, what does Joe have to say about all this?
Dorthy: Joe who?
Kid: Joe Mama!
One episode of Castle: Detectives Ryan and Esposito, two extremely close friends, are captured by the Big Bad. Ryan is tortured for information while Esposito is Forced to Watch. Esposito says he can't stand it anymore, and tells the Big Bad: "Listen to me. You're too late. The cops already know everything about... me and your mom." Then he starts cracking up.
In El Chavo del ocho, whenever Dona Florinda slaps Don Ramón for something she thinks he did or tried to do, she usually tells him to do it to his grandmother. If El Chavo is around, he usually asks Don Ramón something about said grandmother. Feeling offended by the question, Don Ramón hits El Chavo and usually comments something about his grandmother as the sole reason he won't hit Chavo a second time. Example:
Doña Florinda: Next time go act like a clown with your grandmother!
Chavo: Don Ramón, your granny likes the circus?
Don Ramón: TOMA! (hits Chavo) And I won't hit you twice only because my granny was a trapeeze artist...
Dona Florinda's attitude is somewhat justified by the fact she and Don Ramón's grandmother are acquaintances and don't get along.
In Home Improvement, Tim Taylor often utilized this trope on his "Tool Time" co-host, Al Boarland. In the episode where Tim dreamt about an alien encounter and then during a show about roofing (while speculating that Al may be an alien):
Tim Taylor: Your mother is so large, she might end up being your mothership. (Al Boarland then proceeds to attempt to chase and presumably attempt to beat up Tim for that remark as Tim leaves the set, the only thing stopping Al being the harness that's keeping him on the "roof.")
In another episode:
Tim Taylor: Your mother is so large, she has her own zip code.
Averted in Welcome Back, Kotter, when Kotter contrasts the Dozens with the "modern" (1970s) style of insult-duelling starting with the beginning of a classic "Your momma..."
Barbarino: Hey, say whatever you want about my dad or myself, but you don't talk about my mother! That woman's holy.
M*A*S*H - Winchester is angry with Hawkeye and B.J. and stops talking. The two try to goad him out of his silence, saying to him "Your mother wears very expensive combat boots!" and very nearly getting him to crack with "Your parents voted for Roosevelt. Four times!"
This exchange in the mess tent between Burns and Houlihan, post-breakup:
Burns: This place is a mess. Hey, I made a joke! Houlihan: So did your parents.
WKRP in Cincinnati - Herb reluctantly buys a painting at a charity sale to score points with the boss - Bailey likes it and says so, and he gives it to her. Later he hears it may be worth a fortune and tells her he wants it back, saying "I meant 'It's yours' like a figure of speech, like 'I love you' or 'So's your mother!'" When she won't give it back he tells her "I'm very disappointed in you." She looks conciliatory and says "Herb? [flatly:] So's your mother."
In an episode of Dark Angel, when Alec confronts a gang of steelheads who are monopolizing the steroid black market he's trying to break into, a British steelhead named Eddie asks what he needs five hundred dollars for.
Alec (in British accent): Actually, I need it for a ride on your mum.
CSI: Crime Scene Investigation: The owner of a brothel that is a crime scene gets annoyed when Nick won't speed up the search to let him reopen the rooms and comes out with the unusual gem "Your mother sleep with Azerbaijani!"
Stormtrooper: Who are you? Pierce: Your mother's lover. [shoots]
Jeff also fires one off at Shirley when she and Annie are interrogating him over a backfired prank that's caused nothing but trouble. While Shirley is naturally less-than-impressed, unfortunately for Jeff it backfires on him when Annie takes it as a good excuse to slam his head into the study room table.
The Unit: When Bob knocks out a guard at SERE school.
Bob Brown: Tell your mom I'll drop by around 8.
The X-Files had the father variant thanks to Mulder and The Stupendous Yappi, a psychic so phony that not even Mulder believed in his abilities (though he might have had some faint Psychic Powers).
Yappi: [to Mulder] Skeptics like you make me sick.
Mulder: Mister Yappi, read this thought. [Yappi stares at him, then suddenly leans back as if he was hit and raises his eyebrow]
"Your mama’s so fat, she could usefully have a calorie-controlled diet and regular exercise."
Horatio Hornblower, "The Even Chance": During the Inquisition scene when Simpson questions and tortures Horatio, he insults his mother by saying she earns her living on her back. Horatio is absolutely infuriated and tries to fight; however, the evil, villainous Jack is stronger and beats him up frightfully.
The sitcom Ladies Man had an episode where Alfred Molina's character was learning to fight with someone else. One stage of the fight is "And now we have the ritual insulting of each other's mother" or something to that effect, and then they start attempting it.
From Whose Line Is It Anyway?, one session of Hollywood Director had Colin "ordering" his "actors" to redo the scene in Yo Momma jokes.
A sketch on You Can't Do That on Television has the mother walk into the living room, to her child's embarrassment, wearing combat boots. She claims it's (literally) to stamp out cockroaches on the floor.
A quite adorable example from a talkshow on Swedish Television hosted by stand-up comedian Robin Paulsson. The show had pre-recorded sketches starring Paulsson where the humor often rested on him getting things horribly wrong and then digging himself deeper. The relevant example had Paulsson rap-battling in an alley and never once managing to get a boast right or an insult in, in fact just being awkward. In a last-ditch attempt he resorted to the ever-effective Yo Mama strategy. After some rhymes along the lines of "your mom's always kind and helpful", Paulsson looked over his shoulder to find that his homies had left the scene.
Defied in Brooklyn Nine-Nine: Detective Peralta gets into a Volleying Insults match with the obnoxious Fire Marshall Boone. During it, Boone makes a comment that leaves a perfect opening for a Your Mom joke — but before Peralta can take advantage of it, Boone immediately points out that his mother happens to be dead, "so let's tread lightly on the response."
Peralta: That's not fair!
And from Styx's concert video Caught in the Act, taking place in a prison full of robot guards: 'Hey, Roboto! Yer mudda was a Toyota!'
"Yo Mama" by Butterfingers: "Yo mama's on the top of my things to do list!"
"So be kind to your mother Though she may seem an awful bother And the next time she tries to feed you collared greens Remember what she does when you're asleep!
"Your Mama Don't Wear No Socks" was a popular summer camp song. I saw her when she took them off!
The Norwegian metal band Solefald has a Your Mom-joke in their song "Third Person Plural".
"Your Mama Don't Dance" by Loggins & Messina.
Your Mother Should Know by The Beatles becomes hilarious when interpreted as this.
The MC Hawking song "The Dozens".
The Shad song "Real Game", about race in basketball, begins and ends with a short skit of friends playing an NBA game with each other. After the game, the insults get petty, including "Your mom can't dunk!" the standard response being to defend one's mother's honor, the reply is "My mom can dunk, okay?! ... Well, she can touch rim still."
In the wake of 9/11, Ray Stevens released "Osama — Yo' Mama".
The Snaps album featured a number of comedians and hip-hop artists telling these jokes.
Also titled "Ya Mama", this time by the Pharcyde:
...Naked on a mountaintop, tootin' on a flute
Ridin' on a horse drinkin' whiskey out a boot
She got the wings and the teeth of an african bat
Her middle name is "Mudbone", and on top of all that...
"Shell Shock" by Gym Class Heroes eventually deteriorates into a bunch of Yo Momma jokes (complete with booing), before finally ending with:
"Yo, yo momma smells like the inside of this recording booth!" *Laughter*
The Bo Diddley songs "Say Man" and "Say Man Back Again" (from 1959 and 1960, respectively) are based on this.
"Dre Day," a Take That directed at Eazy E following a dispute contains the following:
Scale: Let me put it this way... Have you ever considered a career as a river barge? Garfield: Your mother was a blender! Scale: That hurt.
When he does his act on the fence, he tells his audience: "All you your mothers wear army boots!"
He said this to a dog once, who merely walked away thinking "He's lucky Mom was in the military."
Jon tries to train Garfield to be an "attack cat", and makes a dummy from him to practice. When he orders "Attack!", Garfield tells the dummy: "Your mother wears combat boots!"
When Garfield is a bad mood, he shouts to a bunch of dogs: "All your mothers wear flea collars!" which gets him beaten up.
Garfield barks something to a chained dog, who gets really mad. Garfield explains that it meant "Your mother has fleas".
Odie was chasing cars and Garfield tried to caution him against it because he could get clobbered. Realizing he said "clobbered", Garfield then told Odie a buick said "unkind things" about Odie's mother.
In one of the rare occasions in U.S. Acres where Booker achieves some sort of victory against the worms, he looked into a hole, which Booker then plugged with a cork. Booker then yelled, calling the worm's mother a "garden hose". As Booker expected, the worm hit its head at the cork while trying to return to the surface to respond to the insult.
In a later U.S. Acres story, a worm told Booker his mother swam after garbage scows. Booker reacted by trying to go after the worm, who then retreated itself into a hole where Booker got stuck. Then Orson, whom Booker affectionally calls "Mom", showed up wearing a swimsuit and telling Booker to hurry up because the garbage scow was coming down the creek. Booker groaned in frustration.
Feeling bored, Wade told Cody his mother had fleas so Cody would chase him away.
Orson wondered why Roy considered himself qualified to be the judge of an "ugly face contest". When Roy said he knew ugly when he saw it, Lanolin jokingly mentioned "he should". Roy then asked "what was that about my (Roy's) mother?"
Roy, over a frozen lake, teasing a fish. "Hey, fish! Your mother wears waders!" Then a strong fish breaks through the ice and drags Roy's face into water. Roy ends the strip with a broken and frozen face.
One FoxTrot strip has Jason and Marcus trash-talking each other before a test with "your momma" lines. This strip led to the name of one of the compilation books, Your Momma Thinks Square Roots Are Vegetables.
Caesar from The Boondocks is a walking encyclopedia of this trope.
Curtis is always getting these from the strip's two bullies, Derek and "Onion".
During Repo Man's entrance at the Wrestlemania X-7 Gimmick Battle Royal:
Bobby Heenan: Last week he repoed his own car. Gene Okerlund: About five years ago, he got my mother-in-law. Bobby Heenan: About four years ago, everybody got your mother-in-law.
Alice does this in The Phil Harris Alice Faye Show when she runs out of intelligent comebacks, some of which are dated if one doesn't know the pop culture reference. Others are more general like:
Mr. Monkey: Ahhh! Damn it! Y-You're just a big loser! I'm able to skip the rock as many times as I want! So there! Ha-Ha! Loser! Moron! Idiot! Your mum wears combat boots!
In Neverwinter Nights 2, a female character can respond to Bishop's opening suggestion that she go back to whatever brothel she came from with "Good idea. I'll say hello to your mother while I'm there, shall I?"
Khelgar:(to Qara, after having to explain an insult to Neeshka) But a tankard for effort, your "highness" — by my reckoning, the Flagon's never had a finer table-cleaning* Qara got conscripted into the party after nearly burning down the inn; your foster father's half-brother has her paying for the damage in sweat. goblin-wench. Qara: What, since your mother lost her job?
Paper Mario: The Thousand-Year Door did a variation, where Grubba told the Iron Adonis Twins' that Mario was talking trash about them (hint: he's not), and one of the trash talks also had them being offended due to the fact that their mom had an outie.
Grubba: Hyuk hyuk! Your challenger is real confident, boys! Yep, he's talkin' trash... "Iron Adonis Twins?" he said. "More like Paper Dog-Face Bros.! ...And they stink!" And then he said: "I bet they just play video games an' cry when they lose!" Um, yeah, and then he said... "Outie belly buttons run in their family! Stinkwads!" ...And so on. Yep.
Iron Cleft #1: WHAAAAAAAAAAAAAAAAAAAAAAAAAT!? How does he know Mom has an outie? That jerk! We're gonna blend you up into a smoothie, pal! And then we're gonna drink ya! Oh, and one more thing... Only smelly stinkwads call other people stinkwads! Understand, stinkwad?
Iron Cleft #2: Simmer down there, Bro. You! Stinkwad! You're gonna regret opening your yap, pal! See these bods? Solid iron. See these spikes? Yeah, they penetrate any substance. So, basically, what I'm telling you is that whatever you try will be completely useless. Think that over in the very short time you have left with a functional brain.
SimAnt had a few, if you turned on dialogue. If memory serves, one of them was "your mother was a termite!"
Dragon Age II had an inadvertant one after Bartrand betrayed the group in the Deep Roads. Varric had this to say about his brother.
Varric: I swear, when I find that son-of-a-bitch - sorry mother - I will kill him!
In the DAII "Mark of the Assassin" DLC, we get this exchange between an Upper-Class Twit and the real villain.
Baron Arlange: This is your fault for inviting a stinking turnip in the first place! Your mother would be ashamed!
Duke Prosper: Mmm-hmm-hmm. Says the man whose mother has slept with half of Val Chevin.
In Runescape's "A Clockwork Syringe" quest, one of the insults you can use while interrogating a zombie pirate is "Yo momma has enough chins for 99 range!" note "Chins" is a shortened nickname for chinchompas, a type of grenade weapon used for ranged training. It also means she's fat.
In The Secret of Monkey Island, "So's your mother" is one of the options in Insult Swordfighting that won't win, although it only appears during the training scene with Captain Smirk. Also, if you let the Fettucini Flying Brothers argue over who gets to go in the cannon:
Alfredo: Your mother wears combat slippers! Bill: Leave our mother out of it! Get in the cannon!
In The Curse of Monkey Island, one of René Rottingham's rhyming swordfight insults is "Your mother wears a toupee!", to which Guybrush can respond, "Oh, that is so cliché", which is the same response to a pirate's "En garde! Touché!"
In Tales of Monkey Island, Guybrush gives us, "Your mama's so fat, it's probably a serious health risk for her. She might want to visit a physician about that."
In Shining Wisdom: "Your mama's so ugly she looks out the window and gets arrested for moonin'!"
Asura 1:Your mama's IQ is so low, she thinks "elemental" is four letters in the middle of the alphabet. Asura 2: Your mama's IQ is so low, she thinks a golemancer is what you get when you ask a golemquestion.
Arfenhouse 3 has a boss named "YOMOMMA", who is actually Misteroo's mother. Housemaster laughs at the name.
Phil: My mom just called. Joel: Your mom just called. Phil: ...excellent comeback. Joel: (oblivious) I know.
In one episode, the two girl characters agree that Your Dad jokes will never catch on.
When Joel actually ends up going out with Phil's mom, Jessica, he discovers that Your Mom jokes don't make sense anymore.
Joel: Your mom's a world. She's my world. I guess "Your Mom" insults pack less of a punch now.
There is a channel on YouTube, appropriately named Yomama, dedicated to animating just about every Yo Mama joke in existence. New videos are posted every Monday and Friday, and our host is a lovably obnoxious blonde GastonExpy named Brody. It's all quite entertaining, actually...
Frieza Goon A: "Damn man, you couldn't hit the broad side of a space-barn!"
Frieza Goon B: "Yeah well that's only because I'm too busy hitting the broad side of YOUR MOM!"
Cui and Vegeta do this back and forth. Vegeta does it to Cui, who responds that his species reproduces asexually ("Gross. Out of my way"). Cui then does it to Vegeta in the same ep as the first example.
"My mother's dead."
Which is then chillingly referenced by Freeza during his fight with Vegeta:
Freeza: "Well, Vegeta, time to send you crying home to mommy."
Vegeta: (in extreme pain) "My... mother's... dead."
Jon: Imagine the horrors that await you when you go to Horror Land! That's why we're all wearing pointy hats, truly... Chugga: To defend ourselves from Jon's mother! Jon: What?! Am I gonna have to punch you out? Momma said knock you out 'cuz you've called her a whore! Chugga:: I didn't say that! Jon: I'm pretty sure you just did... Chugga: No, I just said she was scary! And... considering how much of a jerk you are, the person who created you... Jon: Okay, I'm gonna throw you out of a fucking window right now.
Left 4 Farts has the gang jokingly exchanging Your Mom insults on a building's roof while Francis is dangling over the edge of said roof. Zoe finally comes up with this gem:
Yo' mama, is like a brick: she's dirty, she's flat on both sides, AND she always gets laid by Mexicans!
Homestar Runner: Strong Bad apparently attempted one in response to an annoying request from a Polish viewer, but it comes out as "Your mother is the speed limit" ("Twoja matka jest ograniczenie prędkości"). Oddly enough, this isn't a case of My Hovercraft Is Full of Eels because both the email and his response are typed in English and translated by a voiceover.
In Arby n the Chief, virtually half of Master Chief's dialogue consists of these:
"You got -3 kills and 31 deaths!" "Your mom got -3 kills in bed last night!"
It's gotten to the point where the Arbiter can anticipate them:
"Yeah, well I found something way moar better. Your m-" "My mom's pussy."
Boy:Well, your mom turns every conversation into a "your mom" joke and it's becoming unbearable. Girl:I'm serious; I can't take this anymore. I'm leaving. Boy:...That's whatshesaid! Girl:Yes. Yes, it is.
This extends into the alt-text: "Seriously, it's your mom jokes or me." "Then I, like so many men before me, must reluctantly choose your mom."
Also beautifully subverted in #502. Randall Munroe is a genius for managing to turn a stupid Your Mom joke into a genuine Tear Jerker.
"Your Mother is so fat, she beareth the mark of Chef Boy-Ar-Dee upon her posterior. Oh, snappeth!"
Kiel'ndia in Drowtales uses this against Chiri'nide as they fight  and here, and Chiri being Chiri it works perfectly.
During the gubernatorial debate in Ansem Retort, Zexion used the 'you're a towel' strategy against Cid. Aerith noted it was the rich man's Your Mom joke.
This was Aigis's response to Akihiko as to why she, a robot, couldn't open a door.
Invoked in The Class Menagerie. Tony points out that Brad and Kevin don't like their mothers so they should come up with better insults for each other. They promptly start on "yo' room-mate" insults. Tony is their room-mate.
In this strip of the Dada ComicWitch's Brew, these jokes can become an unstoppable compulsion. (Your Mom is an unstoppable compulsion.) Oh, shut up. (Your Mom should shut up.)
In Pokémon-X, May is being pestered by the NPCs of Dewford, who go on and on about "Invincible Legend" and how awesome it is. Eventually, she snaps and tells one of them that the real big thing is "Your Mother". The NPC takes her at her word, and when Brendan explores the town, he hears everyone talking about "Your Mother" and thinks they're the rudest group of people he's ever met. As the comic writer points out, this is actually possible in the games on which the comic is based.
Something Positive: "Careful about bringing up his mom, PeeJee. He's had a deep-rooted hatred of women ever since he learned she secretly was one."
Becca: I hear a lot of talk, but I don't see a lot of action! Zoe: Your mother doesn't see a lot of action. Bob: Oh, come on now. Fighting is one thing, but mother jokes? Aren't we a little old for that? Zoe: Your mother's a little old for that.
In Captain SNES: The Game Masta, Amon gets enraged when Megaman uses "Your Momma" as an insult. Which is strange, because Amon is a physical incarnation, and doesn't actually have a mother.
Played with in Girls with Slingshots: Hazel asks Jamie who will arrange the upcoming party. When Jamie truthfully responds "Your mom!" Hazel gets it wrong and irritably retorts "YOUR mom!" (The joke is recycled from here.)
In the Space Ghost Coast to Coast episode "Batmantis", Space Ghost discovers that Moltar has been kidnapped by a villain calling herself "Your Mother." Not "Mom," as in the Futurama character, but Your Mother.
Space Ghost: Not my mom, someone else's mom. Someone's sick and deranged mom!
Robot Chicken has a Star Warsskit in which the battle between Palpatine and Luke Skywalker was essentially a game of The Dozens with Star Wars-themed Yo Momma insults.
Luke: Your overconfidence is your weakness. Palpatine: Your faith in your friends is yours! Luke: (mumbling) Heh, faith in yo mama... Palpatine:What was that? Luke: I said, you mama so fat, Jabba the Hut said, "DAAAAAAAAAAAMN!" Palpatine: Well, your mother's so ugly, she put the "Ug" in "Ugnaught"! Vader:(Hood accent) OH, "YOU MAMA" FIGHT! [cue stormtrooper audience, chalkboard, Emcee Vader, and hip-hop version of the Imperial March]
Also, the Rom the Spaceknight vs. Jim the Guy with a Giant Magnet:
Rom: You suck.
Jim: That's what your mom said.
Rom: She did not, my mom was a saint
There's also a man who amuses himself with a pull-and-say children's toy.
The cow says "MOOOOOOOO". *Chuckles and pulls again* Your mom says "Wabglwgaw" because my cock's in her mouth.
South Park made an entire episode of Yo Momma (and Penn State) jokes in "The Poor Kid". No need to guess who on this one.
Principal: "You did a 20-minute song and dance number, with 47 "yo mama's so poor" jokes, followed by a finale with fireworks."
Groundskeeper Willie accidentally pulls one on himself while misreading Bart's lips. "What did you say about me mother?! For your information, her feet stink because she works in manure all day! But it's still the best damn Starbucks in Glasgow!" He apparently reads the same thing from a goat later in the episode.
In "Hell is Other Robots," after Rev. Preacherbot chews out a stoned Bender:
Fry: Who was that guy? Bender: Your mama! Now shut up and drag me to work!
From "Kif Gets Knocked Up a Notch":
Bender: What's this big, ugly thing? A frog? A toad? Or your mama!
From "Obsoletely Fabulous" when Bender escapes the modern world and lives on an island with outdated robots. One of them is a robot who can only talk by inserting cartridges of prerecorded answers.
Bender: A working cartridge unit? Wow, you guys went obsolete years ago. Cartridge unit rummaging through his bag of cartridges, picks out one titled "Snappy response" and inserts it Cartridge unit: Your mother.
Also related is this exchange from "Time Keeps on Slipping":
Leela: I don't know how you did it, Fry, but once again you screwed up. Now all the planets are gonna be cracking wise about our mommas. Hermes: I'm just glad my fat, ugly mama isn't alive to see this. Professor Farnsworth: Enough about your promiscuous mother, Hermes. We've got bigger problems.
Fry inadvertently does it when Zoidberg gives him a physical, asking Fry to open his mouth and say some unintelligible alien phrase. Fry botches it.
Zoidberg: What? My mother was a saint! Get out!
Ren and Stimpy had an episode the twosome was trying to break into a prison and after Ren had a tirade against the warden, he pops from atop the wall, shakes his fist angrily and declares: "Yer momma!" in a completely deadpan way.
In the Hulk episode of Fantastic Four: World's Greatest Heroes, the Thing tries to get Bruce Banner angry by saying "Yer momma's so ugly..." before Bruce tells him that won't work. But when he does change, he goes after Ben for it.
Hansel & Gretel: Ah, your mother rides a vacuum cleaner!
Also used in the 1949 cartoon Paying the Piper where Porky Pig (as the Pied Piper) is frequently insulted in this manner by a cat who's furious that all the rats have been removed from town.
Cat: Ah, your sister smokes corn silk! Porky: My sister doesn't smoke corn silk, she works in a butcher shop and smokes hams! ... Cat: Ah, your brother eats jelly beans! Porky: Gee, I wonder how he knows so much about my family?
At the end of the cartoon, the cat resorts to stealing Porky's reward money to get back at him, but Porky manages to steal the money back and tells the cat "Ah, your father drives a p-p-pickle wagon!"
Bully: Your mother wears army boots! Huey: Uhh, yes!
In Sealab 2021, Quinn uses the "That's what your Momma said" variant on Capt. Shanks in "Let 'Em Eat Corn". When Shanks points out how unoriginal an insult it is, Quinn produces a tape recorder and video evidence; much to Shanks' infuriation, it turns out his Momma really did say that!
In the American Dad! episode "Great Space Roaster", Roger forces the members of the family to insult each other. Steve tells this to Francine: "Mom, you are not smart. I don't tell "yo mama's so dumb" jokes. I tell "my mama's so dumb" jokes.
Also when Bullock is giving a speech at the start of an episode...
Bullock: *a bit of paper flies past* Who threw that?!
Also, at the start of another episode, Dr. Weird tries to convince his assistant Steve to chop off his head, in the hopes that the High-Pressure Blood will propel his corpse "all the way to Phoenix!"
Steve: Uh, what's in Phoenix?
Dr. Weird: Why, it's your momma, Steve! Get the axe!
In "Cybernetic Ghost of Christmas Past from the Future", the titular Ghost tells a rambling story about how Santa Claus originated as a paleolithic ape-man who enslaved alien elves to make toys for early hominid children. When he gets to the part about the elves trying to unionize, Frylock has completely lost the thread of the plot.
Frylock: Wait, who unionized? Cybernetic Ghost of Christmas Past from the Future: Wouldn't you like to know? Probably your momma!
Sperg: You got something to say to me, squirt? Mandy: Your mother has a job and is a respected member of the community. Sperg: No one talks about my mother that way!
In Regular Show episode "Prank Callers", Mordecai and Rigby prank Pops by asking him to stay on hold for a call from Joe Mama. Of course, this being Pops, he actually stays on hold.
Invoked in another episode where Mordecai confronts Muscle Man over the latter's Catch Phrase "You know who else _____? MY MOM!" He tells Muscle Man that for the joke to work it should be "your mom", then gives three "your mom" jokes as examples. Muscle Man isn't amused.Actually he didn't care and was just messing with them.
In the DuckTales episode "The Robot Robbers" (yes, it was based on a Carl Barks story), Scrooge had Launchpad McQuack flying a helicopter with a banner reading "MA BEAGLE HAS FLEAS!"
In Pinky and the Brain, one of Brain's plans to Take Over the World required Pinky to make him angry in order to transform into a Hyde version of himself. Unfortunately, Pinky had a hard time deliberately making Brain mad:
Pinky: Your mother, she's, uh, older than you!
Home Movies - Jason and Melissa want Brendon to know his mom is becoming a nuisance trying to work her way into the movie they're making - they confront him with "Your mother." He goes "Whoa!...is that like 'Yo mama'?"
Donatello: Hey, Kraang! The one who is called your mother wears the boots that are made for combat!
Metalhead!Kraang: The comment that is made by you shows ignorance of Kraang. The ones known by you as mother-
Donatello: Just come get me!
Stoked: Bummer understands seagull language and says one insulted his mother.
This trope is probably why the phrase "son of a bitch" exists.
A common Chinese insult is "肏你妈 / 操你媽" (cào nǐ mā, pronounced "tsao"), which literally means "fuck your mother".
In Russian, you can say "Ёб твою мать" (yob tvoyú mat'), which means exactly the same thing.
In German there is also one: "Fick deine Mutter.".
Similarly, the worst insults in Arabic (in Egypt at any rate) are kuss ummak and aḥḥa (both figuratively "fuck!", "fuck that!", or "fuck you!" depending on context), literally translate to, respectively, "your mother's vulva" and... well... it's hard to explain. Let's just say that aḥḥa is derived from aḥḥ, which is the Arabic onomatopoeia for a woman having an orgasm...
In Modern Hebrew this particular phrase and a ton of other Arabic vulgarities are also commonly used.
An example from... the United States Senate? Yeah, sure, why not.
Jon Kyl (R-AZ): I don't need maternity care. So requiring that on my insurance policy is something that I don't need and will make the policy more expensive. Debbie Stabenow (D-MI): I think your mom probably did.
Debatable in real life, because the comeback's been attributed to at least two different people: supposedly someone poked fun at a bald man by running a hand over his head and saying, "Your head feels just like my wife's butt!" Of course, that opened him up to the bald man stroking his own head and saying, "Why, so it does!"
This similar exchange, often considered one of the funniest incidents in sports:
Glenn McGrath: "Why are you so fat?"
Eddo Brandes: "Because every time I fuck your wife she gives me a biscuit!"
Backfired when Rodney Marsh tried to use the line on Ian Botham:
Marsh: How's your wife and my kids?
Botham: The wife's fine, but the kids are retarded.
Ancient Germanic tribes, like the Anglo-Saxons and the Norse, opened all their battles by trading insults about their mothers.
In the late Roman Republic, Cicero was known for his wit. When a man named Metellus repeatedly asked him "Who's your father, Cicero?" he replied, "For you, your mother has made the question difficult to answer."
For a little context, Cicero was a novus homo (new man), meaning nobody in his family had ever been a senator or a member the Roman government before. Asking who his father was was a way of insulting him and saying that Cicero was a nobody, which given how the Roman Republic was far more of a oligarchy than a modern republic, was a big insult and a big impediment to being taken seriously.
Profanity in Latin countries commonly centers around insulting other people's mothers. "Chinga tu madre," or "fuck your mother," is often considered one of the most potent insults possible in Mexican Spanish. "Tu madre es una puta" ("your mother is a whore") or "hijo de puta" ("son of a whore/bitch") has similar effects in many Latin American countries. In Puerto Rico it's sometimes shortened to "tu madre".
In Spain itself, the Spear Counterpart inversion "Tu padre!" ["Your father!"] is also not unheard of, though it's easy enough to fire back with "Tuyo!" ["Yours!"]
Ironically, although insults like "hijo de puta" or "tu puta madre" are so commonplace in Spain they hardly have any effect, apparently innocuous retorts such as "Tu madre... bien?" ["Is your mother doing fine?"] or "Recuerdos a tu madre" ["Give your mother my regards"] can be a veritable Berserk Button, probably because of the subtle implications.
A common comeback is to say "tu jefa" (literally meaning 'your female boss', actually meaning 'your mom').
The usual way to return an insult or to turn a statement into one is to use "tu abuela" or "su abuela" (your grandmother!).
Since the Philippines was a Spanish colony for a few centuries, the word "puta" has made it's way into the native tongue. "Putang ina mo!" (your mother is a whore!) is the most beloved of all curses used by everyday Filipinos, although the shorter "'tangina!" has since devolved into an expression of disbelief, among many other meanings.
In a combination of this trope and Country Matters, the insult "¡el coño de tu madre!" (literally "Your Mom's cunt!") and its abbreviations is the most used insult in Venezuela.
In Brazil (and possibly other Latin American nations), one category of people known for having their mothers insulted like that are soccer referees.
Crossing over somewhat with I Banged Your Mom: In an Australian Rules Football match between the St Kilda Saints and the Brisbane Lions, Brett Voss (playing for St Kilda) was lining up for a shot at goal when he heard someone call out "My old man fucked your mum!" He turned to see that the player who had said it was... his brother Michael, who played for the Lions.
According to Ashley Montagu's The Anatomy of Swearing, the phrase "Kwoy inam!" (literally: "Cohabit with thy mother!") is used as a mild diss in the Trobriand Islands. (It's more insulting to tell someone to screw his sister, and even worse to tell him to screw hiswife.)
Hideki Kamiya loves to reply to stupid Twitter questions with "Ask your mom".
In Romania, the expression "Your Mom" , translated as "Mama ta", is sometimes shortened as "ma-ta". An awful lot of people don't actually know that there's a hyphen between "ma" and "ta" in the short form, causing many comedy shows and blogs to compose a song, "Ma-ta are cratima" ("Your mom has a hyphen") to mock the young who "don't even know how to insult each other's mothers correctly."