At first I suspected there's overlap between Is That What Theyre Calling It Now and Imagined Innuendo, because the distinction wasn't clear to me from the description. I assumed Imagined Innuendo is when there is a genuine misunderstanding between characters and Is That What Theyre Calling It Now is when one character pretends to misinterpret something as an innuendo for the sake of a joke. Imagined Innuendo is indeed what I thought it was, but Is That What Theyre Calling It Now seems to have a problem.

• Wick Check
  • 64% of examples are just tropers potholing to this page to highlight a euphemsim (and not necessarily an in-universe one).
  • 10% are in-universe misanderstanding, i.e. Imagined Innuendo.
  • Only 6% are about intentional misinterpretation, which means my initial assumption was wrong (Also, this might be Heh Heh, You Said "X"). Technically the examples that use the stock phrase might be added here, since it's usually said as a joke. I think. But it's still a stock phrase.
  • 12% are the usage of the stock phrase.
  • 8% are ZCE or unclear.

I suggest disambiguating Is That What Theyre Calling It Now between Imagined Innuendo, Un Entendre, Accidental Innuendo and Heh Heh, You Said "X"

• Radar.Theatre:Arcadia raised this to an art form. Mrs. Chater and Septimus have a "perpindicular poke" in the gazebo which Mr. Noakes accidentally sees through his spyglass, not to mention her other affair with Lord Byron.
• Fanfic.A Day Indoors: All Just a Dream: The common theme across some the stories is that the girls are fantasizing what Negi acts like or otherwise that makes Negi act OOC. The majority of romantic... complications... end with a twist.
• PlayingWith.Men Cant Keep House: Invoked: Bob wants to break up with Alice, but doesn't have the guts to tell Alice, so he starts being sloppy so she'll want to leave.
• WMG.Superior Spider Man: Because Deadpool is the kind of person who could find it out, Loki and Doom could undo it, Squirrel Girl is necessary to persuade Doom, and Peter's love interest provide incentive for Peter to win and distraction to Otto (plus Gwen's ghost would screw with Peter's mind, Deadpool's real reason to bring all the interests there).
• Funny.Game Of Thrones Season Five To Eight: Watching Jon trying to convince Daenerys to travel with him by boat via political/PR reasons becomes positively amusing when they later have sex while in transit. "Sending the North a message that we're allies" my ass.
• The Iliad: Unusual Euphemism: Also, depending on the translation, book 14 is called "Hera Outflanks Zeus".
• Funny.Atop The Fourth Wall 2010 Episodes: "The Internet - It's For Porn!": "Yes, my research forced me to watch a woman taking off her clothes. Truly, I have the worst job in the universe."
• Characters.The Secret World The Big Three: Ship Tease: When recommending that you contact the Jingu, he mentions that he misses, ahem, "corresponding" with Gozen.
• Spontaneous Generation: The Sims: All the Sims have to do in order to make a baby (before expansion packs and later editions with the "Woo Hoo" function came out) is kiss passionately, and suddenly a baby bassinet arrives in a shower of daisies.
• The Voiceless: Isaku, the main antagonist and title character of the Isaku Survival Horror games and its anime adaptions, doesn't speak. He only communicates to the protagonist through notes narrated by someone else and videotapes of his deeds.
• YMMV.Justified: Ho Yay: Raylan and Boyd "dug coal" together.
  Raylan: There's nothing like the bond between two men when they work a deep shaft together.
• Wrestling.Chris Jericho: Long List: Among his many feuds with Stephanie McMahon, he gets a good-sized one in.

  Jericho: As far as your husband goes, he's been gone for such a long time, and I know how lonely you must be. I mean, I know you've been forced to form a "private alliance" of your own with three-quarters of the superstars in that locker room. And the lighting crew, and the camera crew, and the sound technicians, and the stagehands, and the prop guys, and the merchandise-sellers, and the popcorn vendor in the fifteenth-row! Congratulations, Louie!

• Recap.Game Of Thrones S 4 E 8 The Mountain And The Viper: He even desperately admits that he loves her. Daenerys, caught between sorrow, resentment and incredulity - throws his 'love' back in his face, as this betrayal of her has undermined the entirety of one of her oldest, most precious relationships. She declares scornfully that he should go and collect his reward back in Westeros, if he can, that he may never touch or speak to her again and that were he any other man she would have had him executed on the spot.
• Funny.Yu Gi Oh Duel Links: This exchange when Yubel level 50 appears.
  Jaden: I thought exposing you to the healing light of the universe would fix you.
  Yubel: That’s an odd name for the Light of Destruction.
• Recap.Star Trek Deep Space Nine S 05 E 06 Trials And Tribbleations: Aside Glance: Sisko gives a priceless one when Jadzia mentions that Bones McCoy has "the hands of a surgeon".
• Funny.Fire Emblem Fates: At the beginning of Nina and Male Kana's C-support, we have Nina freaking out over Kana taking interest in her and her...hobbies. No, not that hobby! He just wanted to ask her about her life as a noble thief.
  Nina: Huh? What about me? Er...your questions don't have to do with my...ah...people-watching stuff, do they? Oh, man, I am not the one who should be explaining this... Where are your parents?
• Daisy Miller: Frederick Winterbourne, age 27, was just another average, mundane, young man, American by birth but raised in Europe since childhood, until he took a break from "studying" in Geneva to visit his aunt in Vevey, Switzerland.
• Characters.My Otome: Yuri Fan: Yayoi squeals the loudest when imagining the sorts of things Nao would do to Arika as "punishment".
• Fanfic.Time Mix Up: Shotgun Wedding: Gaara was nearly forced to marry Hinata because Hiashi thought he was "training" with Hinata without a chaperone. They were measuring Hinata for the wedding kimono (while she was unconscious) before Naruto cleared things up.
• YMMV.Blakes Seven S 4 E 9 Sand: Alternate Character Interpretation: In-Universe when Tarrant reveals what happened with Servalan.
  Avon: You believed her?
  Tarrant: Not necessarily. I think it was a gambit to gain my sympathy... in a nervous situation.
  Avon: And she got it too, didn't she? Your sympathy I mean?
• Enemy Mine.Literature: The Dresden Files: Harry teams up with Lara Raith multiple times over the course of the series to help them reach mutual goals. They do this quite often in fact, to the point at one instance Lara indicates quite clearly she would rather rule with Dresden together than for them to keep fighting each other.
• Funny.Game Of Thrones: Gethin Anthony revealed at the 2014 EM-Con GoT panel that he wrote Renly/Loras fanfiction to help him understand the characters and their relationship better, but judging by the audience's amused reaction, some dirty-minded fans were evidently hoping that he had composed pure smut. Even Kristian Nairn's face turned beet red when he realized what the crowd were chuckling at. Gethin's expression could be read as, "Damn, I should've expected that the R/L shippers would twist my words in that way."
  Gethin: As preparation for the second series, I wrote myself a little short story about what Loras and Renly did between the seasons, and it's all — (Audience bursts into laughter, including one loud wolf whistle.)
• UnfortunateImplications.Live Action TV: Bridgerton:Some critics consider the final sex scene of Episode 6 to be an example of Double Standard Rape: Female on Male. While it's still Lighter and Softer than the novel's version (in which Simon was drunk and unquestionably unable to consent), it still involves "nonconsensual insemination," which is a form of criminal battery (even if it's the woman who consents to the batter, ba-dum ching.) Plus there's the fact that a black man is sexually assaulted by a white woman, when black men and women are often made scapegoats for sexual violence and the blame is shifted away from the white men and women who assault them. This is not addressed in succeeding scenes, with the show instead of focusing on Daphne's own feelings of betrayal regarding some of Simon's secrets, the discovery of which has prompted her sexual aggression in the first place. On the other hand, Daphne literally didn't know what sex was until she was married, and she still had to find out from her maid how babies are made, so it's asking a little much that she know anything about consent. You can argue this is Deliberate Values Dissonance, in that a husband of the time who didn't provide his wife with children was liable to have his masculinity called into question, but then we're already in an Alternate History where black men can marry viscounts' sisters in the first place, so "historical veracity" has its limits.
• AsongOfIceAndFire.Tropes J To R: Love Dodecahedron: Renly is married to Margaery but spends a lot of time "praying" with her brother Loras, and in the meantime is being crushed on by Brienne of Tarth, who later seems to have developed (possibly reciprocal) feelings for Jaime Lannister, who is in a secret relationship with his sister Cersei.
• Mad Max: Beyond Thunderdome: Depraved Bisexual: A lot of the bad guys are wearing BDSM-style clothing, and when Max claims to the manager at the trading post (who's just concluded a deal with a trapper for a night in the sack with a real woman in exchange for an animal pelt) that he's got skills to trade, the manager replies "The brothels are full."
• Have a Gay Old Time.Mythology: The story of Balaam from The Bible (Numbers 22) is chock full of unintentionally amusing lines regarding Balaam's ass. Mention is made of how Balaam "smote the ass with his staff" (22:27). In 22:30, it asks him "Am not I thine ass, upon which thou hast ridden ever since I was thine unto this day?" Because of this the story has on occasion been jokingly summarized as "God visited Balaam and talked out of his ass."
• WMG.Star Wars Legends: Think about what we know about Palpatine: He's obsessed with superweapons, and he did away with the only people who would oppose genocide, because the only way to defeat the Yuuzhan Vong was to destroy them entirely. In addition, Palpatine knows about the Yuuzhan Vong because of his connections to Thrawn. We also know that Luke carries Anakin's name and lived with Anakin's family on Anakin's home planet. He's not hidden very well. Palpatine let him survive because Palpatine knew only Vader's grandchildren could defeat the Yuuzhan Vong. We also know that Force-sensitive clones are mentally unstable. What does this have to do with the Emperor's Hands? The name "Emperor's Hand" comes from an ancient method of extracting DNA before cloning technology was perfected. Palpatine, knowing only of Luke (and besides, Luke can have many more children than Leia can just by virtue of being male), recruited young girls and trained them as assassins, but the assassin job was just a cover for their real purpose: To be the mother of Luke Skywalker's children. The male Hands only exist for the sole purpose of perpetuating this facade. This is why Palpatine was thinking YOU WILL KRIFF LUKE SKYWALKER! at the end. It was the last command.
• WMG.Doctor Who Classic Series: Point 2. Jo and King Peladon seemed a bit flirty with each other, and, considering the New Series theme of "dancing", it's not that far-fetched to imagine something happened between them at some point when they weren't on-screen.
• Robosexual: Lexx's 790 was a robot head (mis-)programmed for love, yet incapable of interfacing with anyone as he lacked even a tongue. Not that that stopped a robot head fetishist who owned a special groin attachment...
• Characters.Manhunt: Upper-Class Twit: Considering how they fall for the same Artificial Stupidity as all the other hunters, they may unintentionally come off as this. One example is actually used in game as well:
  Watchdog: Spengler, look for Higgs and Spaulding - they should be coming from the "adult specialty shop."
  Spengler: It's called "porno", genius.
• AccidentalInnuendo.Harry Potter: The whole scene of Krum attacking Cedric.
• Recap.Justice League Unlimited S 2 E 8 Hunters Moon: Unusual Euphemism: Shayera mentions having "seen [John's] underwear drawer".

• Recap.Doctor Who S 36 E 11 World Enough And Time: Is That What Theyre Calling It Now: Missy wants to know what to call Bill and Nardole: companions, pets, snacks?
  Bill: He calls us friends.
  Missy: Ew, Doctor. But think of the age gap.
• Talk About That Thing: In The Order of the Stick, Elan and Haley come up with an excuse that they have to "give their pet orangutan a bath" when they want to speak with Durkon. Tarquin mistakes it for a Sexual Euphemism. Later Elan comes up with the excuse that they need to have sex instead.
• Recap.Inspector Lynley S 03 E 04 If Wishes Were Horses: Is That What Theyre Calling It Now: Havers' euphemism backfires when she asks Maureen if Dermot Finnegan had been "seeing" Grace during their marriage.
• Recap.Buffy The Vampire Slayer S 3 E 4 Beauty And The Beasts: Is That What Theyre Calling It Now:
  Oz: Debbie. (Giles looks at him) Well, victim number one, Jeff. He was in jazz band with us. They used to horse around.
  Faith: They were screwing?
  Oz: I don't think so, but he hid her music comp book once.
• Leverage.Tropes E To I: Is That What Theyre Calling It Now: From "The Double Blind Job":
  Hardison: Li'l Jennifer Pearson's wearing you out, ain't she?
  Eliot: Dude, we walked the Freedom Trail twice.
  Hardison: Nice!
  Eliot: No, man, the actual Freedom Trail. We took paddle boats to the public gardens, shopped on Newbury Street, and went to something called the Boston Duck Tour.

• WesternAnimation.F Is For Family: Is That What Theyre Calling It Now: Kevin reassures Frank that he's not doing anything with the girl down the street. Frank sarcastically tells him that he used to "not do anything" too, and that's where Kevin came from.
• Recap.Frasier S 06 E 06 Secret Admirer: Is That What Theyre Calling It Now: When Niles mentions Maris just responded to his defiance by "stroking her ocelot", Martin quips that they have a cream for that.
• Lady in the Dark: Is That What Theyre Calling It Now: Charley insinuates that "color plates" might be the new "etchings":
  Russell: Maggie—either Alison leaves the magazine or I do. This is the end—the absolute end.
  Maggie: Now, Russell...
  Russell: I meant it. She's just calmly loaned my color plates to a friend until Wednesday.
  Charley: Say, that's kind of new... "I'd like you to come up to the apartment and see my color plates."
  Russell: Oh, don't be so Goddamn bright, Johnson—you sicken me.

• Funny.Jemjammer: Jyll tries to excuse herself by saying she needs to "polish her hammer".
  Aelfgifu: Oh is that what we're calling it now?
• Film/Puhdistus: Is That What Theyre Calling It Now

  Aliide: (to Zara) You're a mobster's wife. Or a businessman's, as they call them nowadays.

• Recap.Inspector Lynley S 04 E 04 Word Of God: Is That What Theyre Calling It Now: When Lynley tells Havers that he is going to have dinner with Christine Miller and "talk about work", Havers responds with this phrase.
• Quotes.Epic Fail: ->"BZZZT! Wrong answer! That's what the kids call 'Epic Fail'."
  — Saul Goodman, Breaking Bad
• Fanfic.Not The Intended Use Zantetsuken Reverse: Accidental Innuendo: This particular exchange.

  Soma: I'm going to do experiments with Mina.
  Naoki: [sly grin]
  Soma: [blushing] Magic experiments!
  Kazuya: Is that what kids are calling it these days?

• Fanfic.The Alarmaverse: Is That What Theyre Calling It Now:
  “And why else would [Pinkie] and Dash spend so much time alone?”
  “Because they’re prank buddies?”
  “Ooooooohhh,” the Mayor said, winking at Ditzy, “is that what the kids are calling it these days? Say no more, Ditzy, say no more.”

• Recap.The Flash 2014 S 7 E 14 Rayo De Luz: Is That What Theyre Calling It Now: Barry and Iris are going off the grid to "reconnect" a bit. - unclear if that's in-universe or a troper's comment
• Simoun: Unusual Euphemism: "Let's do a Ri Maajon." Is That What Theyre Calling It Now - unclear if that's in-universe or a troper's comment
• Alabaster: The Doomed Session: Is That What Theyre Calling It Now: Vamuin during the Vast Log.
• Fanfic.Crosswinds Of Fate: Is That What Theyre Calling It Now: When Luvia tries to justify blackmailing Shirou for sex as an incentive to accept her offer and calls it "the carrot and the stick", Zelretch wonders this about "take the carrot."