The series loves coming up with deliberately goofy slang, such as "mathematical" and "algebraic". Largely justified, in that it takes place in a post-apocalyptic world, meaning that the characters' understanding of slang would be taken from the movies, video games, and other entertainment that remained after the Great Mushroom War.
Party Pat: "That monster's gut was totally excellent".
Lumpy people have "lump/ing", "buumps", and overuse contemporary slang like "totally", "whatever" and "awesome".
Disney Channel's American Dragon: Jake Long is chock-full of awkward attempts at writing circa-early-nineties skater-boy talk among the lead Token Trio. It got toned down in the second season and was even called outdated by his sister. It was half-deliberate. The writers originally wanted Jake to slip into progressively worse slang when he was about to do something stupid or morally questionable, but Disney missed the point and made them scale it up the rest of the time too, under the delusion that this would make it relevant to children. Then they yelled at the writers at the end of season one when they actually read reviews criticizing the overused slang and made them tone it down in the second season. It ended up pretty close to where the writers wanted it all along.
Avatar: The Last Airbender has an in-universe example: When Aang is in the Fire Nation, he tries to blend in by using 100+ -year-old slang that gets him all kinds of odd looks. Imagine someone nowadays saying "Bully!" to mean "Awesome!" That's how Aang looked to the rest of the Fire Nation.
Hotman. (Hotman. Hotman...)
The now infamous pilot for the Battletoads cartoon is cosmically psychotronic! The games were hardly innocent of this, with Catch Phrases such as "Mad, bad, and crazy, 'Toads!"
Gwen: I'm at one with the cosmic mana, feeling the energy of the universe flowing around and through me.
BoJack Horseman parodies this in Season 5, when Officer Meow-Meow Fuzzyface pulls a sting operation while riding a scooter, wearing a hat labelled "Teen", and asking "Is it 'lit' under here?"
In the direct-to-DVD movie Bratz: Rock Angelz, the main characters can't seem to go two minutes without exclaiming that something is totally "slamming," "rocking," "styling," "scorching," or, in the case of a punk rock night club, "punkalicious."
Parodied extensively in an episode with the product X-Stream Blu (which notably contains a hip spelling) in the spirit of Go-Gurt and like commercials. Among the blatant attempts to seem hip include the phrases "to the max", "legit-ass contract", and the random string "Sick! Tight! Cyber! Awesome!" Yeah, that energy drink is cyber. One of the executives in the background during the Totally Radical moments tends to shout out how this type of pandering has destroyed his dignity. "My son won't even look me in the eye anymore!"
In one of the first episodes, Principal Scudworth goes undercover to a party and constantly spouts phrases like "raise the roof" and "tight", among others.
One of the many reasons Da Boom Crew failed. "Tony Hawk it later"? What does this even mean?
Mr. Lancer especially. He even has a book called "How to Sound Hip for the Unhip", which he often reads from when attempting to "connect" with his students, which is horribly outdated. Even the students give him weird looks and try to leave when he attempts to talk to them from it.
Batman Beyond largely averted this trope by sticking to Future Slang, but one splicer's warnings to not "diss" him stuck out like a sore thumb in the second season premiere.
Parodied brilliantly in the Batman: The Animated Series / The New Batman Adventures episode "Mean Seasons," one of whose scenes shows a group of network bigwigs pilots:
(kid with backwards baseball cap and shades skateboards up to the camera, pulls out a police badge): Kid: "You're busted!" Announcer: "Teen Cop: inner-city street drama with a fresh attitude." Kid: "Education RULES!"
In Justice League, the Flash generally speaks with more slang than the other members, but not to the extent of this trope. However, Batman once spotted Clayface imitating the Flash by the way his speech did fit the trope. "You overplayed your part, yo."
On Doc McStuffins, sometimes some of the older toys or ones about specific subject matter use slang such as "Far out." This once got Doc an odd look from her Dad when she described a meteor shower as being "Far out" after hearing the phrase from her toy telescope.
Dude, That's My Ghost! (if the title didn't tip you off) has this in spades, mostly hinging on cool-sounding puns, nicknames and incredibly, achingly "cool" voicework where you're not sure if it's parody leading the dialogue or a very lost sense of how people speak.
Tends to be the default mode of both Kevin and Nazz in Ed, Edd n Eddy. Kevin's particularly fond of calling people he doesn't like "dorks" or some variation thereof, and insulting Edd with "Double Dweeb" (as opposed to his usual nickname "Double D"). He's also into stereotypically cool things like customizing his bicycles.
Parodied in the episode "Bye Bye Nerdy" from Foster's Home for Imaginary Friends from 2004. Bloo, under the belief that Mac is a nerd, tries to teach Mac to be cool. This involves making him dress in a fashion that is years out of date (as in, from explicitly 1987), watching totally-radical-in-their-own-right juice commercials, and looking at boy bands (which were already becoming outdated). When Mac goes to school and does what Bloo says, he becomes the laughing stock of his school.
Futurama simultaneously avoids and parodies this trope:
The youngest adult main character, Amy, uses semi-current slang with science-fictiony add-ons. (For example, shmeesh=yeesh, splech=yech, guh=duh, etc.)
Conventional totally radical speech was parodied by That Guy in the episode "Future Stock." He was awesome... awesome to the max.
In Roswell That Ends Well (set in the '40s), Leela goes all over the map with her 20th century slang. ("What's up, Holmes?")
Played with in Zapp Dingbat, when Leela addresses her chilled-out father who has been using conventional surfer slang.
Leela: I don't want to put a rat in your face-cage, or whatever you kids say nowadays.
In an episode of Garfield and Friends, Jon's teenaged niece talked like this and Garfield and the narrator had to do translating duties every time she spoke. Eventually, poor Garf' started talking this way himself. (The sound of Lorenzo Music uttering "Gag us with a spoon, dude" in that famously dreary voice of his is undeniably a hilarious moment.)
In the episode "Dungeons, Dungeons, And More Dungeons", Dipper mentions how the creators of the titular D&D expy tried to make it "cooler" in the 90s, giving Evil Sorceror Probabilitor pastel-colored streetwear and a bit of rapping in the commercial the audience is shown, as well as renaming the game "Diggity-Dungeons And All That". From Dipper's comments, it's considered a Dork Age for the game.
Upon finding Mabel in the Lotus-Eater Machine that is Mabelland, Dipper, Wendy, and Soos are greeted by Mabel's "backup Dipper" Dippy-Fresh, a skateboarding "cool" dude that wouldn't look out of place in a Mountain Dew commercial. Naturally, Dipper takes an instant dislike to the doppleganger.
From one of the shorts, we have Blubs and Durland's PSA on peer pressure. It ends with Wendy and her friends stealing the officers' uniforms and car, with Wendy mocking the two on what they're wearing.
In Jetsons: The Movie, which was in production around the end of the 80s, George's new co-worker Ruby-2 explains the sprocket-making process to him through a rap song.
On an episode of Jimmy Two-Shoes, Lucius tries speaking in slang during a commercial for his cologne. Jimmy notes, "It's almost cool how uncool he is."
Johnny Test itself is full of this, giving it a bizarre late-90's type of atmosphere, but these examples are very noteworthy:
Spoofed with Bling-Bling Boy, a rich jerk who's Johnny's recurring nemesis. He came up with the name in an attempt to be cool. A Running Gag is when people refer to him by his first name, he insists that you call him Bling-Bling Boy. It was eventually dropped when the characters learned to humor him.
The Extreme Teen Team, a group of "evil" skateboarding adolescents. They steal energy drinks and snacks and shout "EXTREME".
Kim Possible mostly used Buffy Speak, but also threw in a few characters who spoke in out-of-date slang for comic effect:
A throwaway gag in one episode involves Dr. Drakken learning the phrase "off the heazy" from a book on teenage slang, prompting Shego to question its validity. And apparently, he loved being "hip" so much that he continued to use terribly out-dated or poorly delivered phrases for the rest of the series. Thanks to Drakken's VA, John DiMaggio, it was hilarious. "Why you got to leave me hangin' like that, yo?" and "Word to yo' mutha!" are examples.
Also briefly attempted by Mrs. Dr. Possible. Kim's reaction: "Mom, you're already cool. Don't push it."
While most of the characters in Looney Tunes were no strangers to using slang that is now considered dated, the one major stand-out is their last recurring character, Cool Cat, who reflected on the beatnik culture of the time and frequently used terms like "groovy" and "baby". Because of this, and his Limited Animation art style, he's considered even more dated than Bugs or Daffy despite debuting nearly 20 years later. As a result, he's seldom used today.
Used on Miraculous Ladybug, with Nino, Alya, and Chloe being the biggest offenders. They regularly say things like "off the chain" or "hot mess."
In one episode Jenny reads a slang book in order for her to fit in, only for her to realize that the book was published in 1983. Gnarly! Taken even further in the same episode, when a strange person finding an opportunity to chat note actually Vexus in disguise speaks in 1920s slang.
It's parodied further in a scene where Brit is trying to teach Vexus how to fit in and lets out a BARRAGE of mid-2000s slang.
Brit: "Look, Vex, just don't go buggin' and actin' like a punk. Youve gots to be poppin', classy. Act like you got some badonkadonk! Can you represent?"
Parodied when Rainbow Dash insists that her pet must possess "coolness," "awesomeness" and "radicalness." When Twilight Sparkle points out those three mean the same, she is given an Affectionate Gesture to the Head by Rainbow.
Gilda from "Griffon the Brush Off" was this so bad that it hurt. It's quite possible Rainbow Dash learned this from her, since she talked in nothing but Totally Radical for the entirety of her episode (complete with guitar riffs). Of course, since the viewers were supposed to dislike her, it actually worked out.
Done intentionally in "Testing Testing 1 2 3" where Pinkie's "educational rap" about the history of The Wonderbolts is a spot-on pastiche of The '90s.
The episode Fake It 'Til You Make It has Fluttershy using phrases like "woke", "lit", and "lowkey savage" while pretending to be a hipster. They're acceptable in usage but they're not really associated with hipsters. That might be the joke because Fluttershy is going off of stereotypes she knows little about.
There's regular use of "dope" and "radical" in the script of Neo Yokio, as well as other trendy phrases like "fuckboy".
In Peppermint Rose Rose escapes from Buddy Bug via a rapping riddle contest, and her favorite food is pizza.
Lampshaded when Professor Utonium makes himself a super suit and joins the girls on their missions. He uses slang, but it's the slang from when he was a kid. The girls react appropriately.
Professor Utonium: Bring it on, daddy-o.
Mojo Jojo: Oh that is so lame. You will pay for your use of inappropriate dialogue!
Then there's the knock off PPG in "Knock it Off," especially in the case of Buttercup's clone "Girl Power."
Played straight in The Powerpuff Girls (2016). Buttercup has a tendency to say "dude" a lot. It's not exactly a term most five year olds in the 2010s use, though it signifies her as One of the Boys. Bubbles is apparently the most Internet savvy and it shows. In "Painbow" she says "I can't even-!" and "OMG, yass!" when she meets the cute panda antagonist.
The episode "Summer Bummer": Hey, Bro Sharks... the 1980s called. They want their clichéd valley/surfer-speak back.
Quack Pack, a mid-nineties reboot of Huey, Dewey and Louie, stated, in that obnoxious talking bubble-tape voice, that "they're not kids anymore. They're EXTREME TEENS!!!!" Followed by one of the ducklings riding a skateboard saying "Ex-treme!"
In the Ready Jet Go! episode, "The Plant From Bortron 7," Jet says "Hey, daddy-o! What's shaking?"
Miss Grotke on Recess often makes use of outdated slang.
Rocket Power: Oddly lampshaded (sort of) in an episode where the cast laments the "Kooks" (non-local) and such stealing their "lingo" and using it without the proper pronunciation or usage. This is remarkably tone-deaf coming from a show that was just as likely to horrendously misuse slang as the Kooks are in-universe. "Remember when the Squid totally BEEFED IT?"
"New Kids on the Blecch" features *NSYNC doing a self-parody in which every other word out of their mouths is either "square" or "old-school."
Bart Simpson's image in early 90s pop culture can be seen as Totally Radical, even though this was never really part of his persona in the actual show (his skateboarding in the opening sequence perhaps being the closest he ever came). The episode "Bart's Inner Child" parodied this phenomenon, right down to the quoting of "Cowabunga". When popular perception of the show began to focus more on Homer's antics, this aspect subsided.
Even lampshaded a few times such as in "Simpson Tide," when Bart tries to show he's still cool by singing and dancing to the "Do The Bartman" song. Ralph comments "That is so 1991." In "Summer of 4 Ft. 2," Bart complains about Lisa using his old "Don't have a cow man" catchphrase to his mom. Marge retorts he doesn't even use it anymore.
Moe: OK, here's the 411, folks: Say some gangsta is dissin' your fly girl...
Sonic Sat AM has shades of this, with Sonic's catchphrase "way past cool," but Sonic Underground took this to a whole new level with Manic, who was raised by thieves and repeatedly uses lingo like "crashing!" "ripping!" and "bogus."
Chef describes a variety of words used in lieu of "house", such as "hizzy," claiming that blacks are changing the word to keep white people from using their slang. Eventually, the word for "house" is "flippity floppety floop." Which Mr. Garrison (at that point a Flamboyant Gay) immediately steals, much to Chef's chagrin. It severely chagrined my dazzle as well.
In the beginning of "Butt Out," an anti-smoking group performs at South Park Elementary, trying (and horribly failing) to reach the kids this way. When they tell the kids that, by not smoking, they can be "just like them", the boys look at each other, horrified, and the show cuts to them chain-smoking behind the school as if their lives depended on it.
Exploited by the parents in "Chinpokomon," when they discover that the surefire way to get their children to abandon the fad is to make a show of feigned, stilted enthusiasm for it.
Mr. Krabs asks his daughter Pearl if he's still cool. Pearl responds that the word "cool" is no longer considered hip, and that kids now say "coral". The minute Krabs starts saying "coral" (he pronounces it "corral"), Pearl calls her friends to tell them that "coral" is definitely out. Meanwhile Pearl and her friends themselves sound like stereotypical eighties Valley Girls.
Also parodied in a later episode; Patrick, upon getting tanned, remarks that he feels like one of those hip young folks from the soda commercials. Cut to a live-action sexagenarian drinking from a can of soda on a psychedelic background, with dramatic zooms and loud rock music, while an announcer screams about how "radical" the drink is.
Super Friends. In the first episode of the 1973/74 season, "The Power Pirate," Wendy and Marvin spoke like 60's hippies, regularly used terms like "groovy," "cool," "right on" and "far out." Apparently the writers figured out how silly this sounded and they didn't speak like this for the rest of the season.
The youngest Titan, Beast Boy, in Teen Titans uses a lot of surfer slang like "dudes." The series is implied to take place in California, though. This is even more noticeable in Teen Titans Go! as he's much goofier and more laidback.
The "Rad Dudes With Bad Tudes" episode of Teen Titans Go revolves around this and parodies it. Robin says "rad" and gets called out by the other Titans for using outdated slang. He is the only one of his group to consider rollerblades cool. The others think they're old and call rollerbladers "grandpas." The entire episode is full of 1980s slang and the Titans start dressing like neon, 80s stereotypes.
Teenage Mutant Ninja Turtles (1987) used (largely out-of-date) California surfer/valley-speak. It was primarily Michaelangelo who spoke like this. Except for the beginning and ending of the first live-action movie, the other Turtles only did it sufficiently rarely that it was usually considered out of character when they did.
The Turtles' early overuse of Totally Radical speech was parodied in a sketch on Robot Chicken, where the Turtles said things like "Tubular!" "Radical!" "Awesome!" "Reaganomics!"
Heck, the Turtles parodied themselves in the live-action movies. Donatello could never pick out the right word. "A Capella!... Perestroika? Oh, I know! Frere Jacques!"
In Turtles Forever, one of the 80s Turtles exclaim "Totally Radical!" when riding in the 2K3 Turtle Van.
In the 2003 TMNT series, they don't talk like this, save Mikey, who tries it, but the others tell him to cut it out. (Naturally, he loved the 1987 Turtles.)
And the eighties series also had the Neutrinos, the "Hot Rodding Teenagers from Dimension X," who spoke with a slang that was even more Totally Radical and was based on teens from the fifties rather than contemporary surfers like the Turtles.
In one episode of The Tick, where the villain is a super-intelligent child, the Tick attempts to relate with him by talking like this.
On Toot & Puddle, the characters, particularly Toot, will sometimes say "Gee willikers!" which surely went out of fashion sometime around the 60s.
Chris McLain from Total Drama uses the words "dude" and/or "bro" every other sentence when addressing the contestants. This gets Lampshaded when Chef reads Chris's cue cards, showing viewers that Totally Radical language is not as easy as Chris makes it look.
Jazz is supposed to be the young, cool, hip robot. Unfortunately, he's usually about 30 years behind with his "cool" phrases, and nobody seems to notice.
And Transformers Animated brings us the Headmaster, who uses gamer slang instead of the usual '80s works... but still manages to be just as bad (or So Bad, It's Good), with his constant shouting of "lamer" and "ownage". They even lampshaded it:
Headmaster: I am so l33t! Optimus Prime: Yeah? Well, I have no idea what that means!
The worst part about this? Isaac Sumdac (a robotics professor in his 60s) has tried to adopt "Total OWNAGE, N00b!" when using the Headmaster unit as his personal catchphrase. It's hideous and it's a good thing that Megatron stopped him.
In Beast Wars, Cheetor began the series as a version of this, constantly saying things like "Ultra Gear!" and other radical things. The writers and the voice actor all hated this, and the lame dialogue largely went away by the end of the first season.
"DreadWING / is punishING / his Gatling gun is ILLIN'!"
To say nothing of the big bad battlin' Bruticus. (Some forget, but it is in fact Onslaught who is the metamorphin' dudicus.)
Wander over Yonder has Emperor Awesome, a muscular spray-tanned man with a shark head who acts and speaks like some weird mixture of a surfer bro, a 90s dude and a millennial (and he is exactly as hammy as that description makes him sound). This is all intentional to make him an annoying yet entertaining douchebag.
In one episode, Wander and Sylvia help some children who tell them stories about how they imagine of a legendary hero who is actually Wander himself (but he doesn't let them know that). One of these stories features him as this kind of character, who is much more annoying and more of a Jerkass than the real Wander, who doesn't like that version of him. He even has the Fan Nickname "Wandy Fresh" because of his similarities to Dippy Fresh.
Widget the World Watcher and Mr. Bogus (both from Zodiac Entertainment) are guilty of abuse of the word "awesome" in their opening titles (compounded by the latter dragging in "bodacious"), which get in the way of their otherwise awes- good theme tunes by Dale Schacker, who wisely avoided such slang with Saber Rider and the Star Sheriffs.
In season 1 of 4Kids's dub of Winx Club, Musa seems addicted to slang. Her use of it is gradually toned down in S2.
Jubilee in the original X-Men cartoon laid the Valley Girl slang on thick even by the standards of the time, with many lines sounding like they came from a Random Nineties Teen Phrase Generator. "Does a mallbaby eat chili fries?"
Kitty Pryde originally used lots of somewhat-dated Valley Speak.
Justified for the show's version of Forge, who was literally caught in a timeless limbo since the mid-seventies, and sounds just "groovy". And it was lampshaded by Nightcrawler:
Kurt: Dude, I swear, that homie's lingo is so wack!
In a very transparent attempt to not make Spyke seem "urban," the writers had him using all sorts of skater lingo.
Yo Yogi! is the kind of show that could have only been spawned in the early 1990s, featuring Yogi Bear and company wearing neon-color clothes and backwards baseball caps, hanging out at the mall, skateboarding, and doing other typically "cool" '90s stuff. It's one of many reasons that Yogi doesn't star in regular cartoons anymore.
Happens to some extent in the Young Justice cartoon. For instance, Artemis insults Kid Flash by calling him "Baywatch", a reference to a TV show that ended when she would have been around 5 years old.