Crediting Acebrock for the OP. They gave permission for others to launch this thread on TRS Queue

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Gainaxing is one of the oldest tropes on the site, being launched way back before June 2007 (the earliest date given for any trope page is June 14th, 2007, apparently. Gilligan Cut, the oldest trope page on the site, gets the same creation date), and it has all the baggage you can expect from a trope that old. The name is bad, relying on an anime fandom meme for a now largely defunct company that was coined almost thirty years ago, but that doesn't seem to have affected the growth. However, Big Bouncy Wick Check showed that the trope is a magnet for ZC Es and examples of "breasts bounce" without any meaning. Not helping is that the description doesn't really offer any possible meaning to the trope. Misty May is a closely tied YMMV concept that has zero links from YMMV pages, and falls under not thriving regardless (18 wicks). It's also a weird concept (one full breast bounce = one misty may) that doesn't seem like a trope, ymmv or anything at all that fits on mission.

Specific numbers:

• Linked within example, apparently played for fanservice 5/ 64 7.8%
• Linked within example, not enough context about this trope 7/ 64 10.9%
• Focused on jiggling and/or bouncing without any other context to what the trope means 17/ 64 26.5%
• ZCE (includes examples that apparently expect you to know what gainaxing is before reading the trope example) 22/ 64 34.3%
• Played for fanservice, enough context 1/ 64 1.5%
• Linked in quote, not enough context 1/ 64 1.5%
• Doesn't refer to breast bounce 1/ 64 1.5%
• Played for fanservice, not enough context 1/ 64 1.5%
• Played for laughs, seems like enough context 2/ 64 3.1%
• Author Appeal 1/ 64 1.5%
• Something other than breasts jiggling 1/ 64 1.5%
• Weblink as example 1/ 64 1.5%
• Other 4/ 64 7.8%

Based on the above, Gainaxing desperately needs some sort of help.
I have three proposals in mind for this trope:

1. Redefine and rename to focus on the fanservice aspect
2. Split between two tropes. One for fanservice focused boob bounce and the other for comedy focused boob bounce
3. Disambiguate between other boob focused tropes.

My preference would be number 2, because it covers the most bases and the concept behind it being used for comedy or fanservice seems tropable (though not under one umbrella), but no matter what, it can't stay like it is.

For the record, the definitions I'm thinking of:

• Fanservice focused: the breasts receive camera focus as they bounce or one or more characters stare at or call attention to the bouncing chest (including, in the latter case, the owner of the bouncing boobs herself)
• Comedy focused: the bouncing boobs cause comedic issues (like knocking something down) or receive comedic reactions from other characters (like a snarky response, like those included in the wick check, or comical overreaction (for example, Blanc getting angry at Vert's bouncing boobs in Hyperdimension Neptunia Rebirth 1 and trying to cut them off, which is played for laughs).

As to Misty May, I say cut it and be done with it. It doesn't really fit anywhere and comes off as mildly creepy to me.

• (Sexy Secretary) The Suicide Squad. Camila—President Luna and later Suarez's assistant—is seen for only like a total of 5 seconds, but even in that miniscule amount of screen time, we can see that her defining characteristics are her massive tits that bounce all over the place.
• (Theiss Titillation Theory) Endless Frontier:
  • The game's leading lady, one HRH Kaguya Nanbu, has huge tracts of land stuffed into a microdress held on by the cruelty of the Universe. She has an extremely acrobatic fighting style, which results in, uh, earthquakes, in keeping with the metaphor, but never a wardrobe malfunction. Whoever enchanted that thing deserves either a medal or to be hanged, depending on your perspective.
• (Raw Deal (1986)) Show Some Leg: A mobster is sitting in his car, gaping at the sight of a female jogger Gainaxing towards him. She leans down with a big smile, sticks a gun in his face and suggests he go tell the drug house he's guarding that he needs to take a leak. With the sentry taken care of, a squad of detectives pull a crash-bang-gotcha on the occupants.
• (Sol Trigger) Fanservice: From Gainaxing by Ema and Sophie as well as Wilma and some from post-timeskip Cyril to Fran and Sophie's as well as Wilma Stripperific choice of clothing to shots of half-naked characters being revived in the Sol pool.
• (Super Robot Wars) Fanservice:
  • Gainaxing: Holy crap, particularly whenever an original female character has a Super Move Portrait Attack. Some of them get so ridiculous you'd think their chest has its own gravity field. Latter games tried to tone this down, however, with the bounciness being reduced to a more respectable levels for the mainline games. The newer handheld games like X-Ω and DD still goes more all out, though. Borderline between this folder and the one below

• (World of Buxom) Divergence Eve: Despite being very dramatic and nearly devoid of comedy or mention of them, the entire female cast (with the exception of the flat-chested android) have very large breasts that begin Gainaxing with every turn.
• (FLCL) Unusual Euphemism: A number of fans think of the title of the show as one — either as a mispronunciation of "Furry Curry" or as the onomatopoeia of bouncing breasts. Also a YMMV entry masquerading as an objective example.
• (D-Frag! 1/2) Accidental Pervert: Twice towards Takao and her Gag Boobs — in Chapter 6/Episode 3, Roka shoves her in jealousy for trying to come closer to Kenji (only to be rebuffed by his spiky hair), causing him to turn around and get a faceful; and in Chapter 9/Episode 4, the first thing he sees upon exiting the clubroom is her Gainaxing while jumping up and down trying to remove the "True Game Development Club" poster hung over his clubroom after winning the School Festival contest against Takao's Game Development Club.
• (Anime & Manga) In Macross Frontier, Ranka Lee enters the Miss Macross competition and suffers a case of A-Cup Angst as several other contestants bully their way past her with copious amounts of Gainaxing. Ranka's best friend Nanase tries to reassure her by telling her that size doesn't matter and cue Nanase's own Gainaxing because she's the most well-endowed woman on the entire show. More so than those contestants even.
• (Sanity Not Included 2/2) Gag Boobs: Nina, as per Gainaxing above.
• (Batman: The Brave and the Bold 1/2) Does This Remind You of Anything?: In the prologue before "Chill of the Night!" featuring Bats teaming with Zatanna, they take on the evil master magician Abra Cadabra. He battles Zatanna, and in order to keep her from verbalizing her spells, gags her, and then promptly does the old scarves-down-the-throat gag... which lasts curiously long and looks, well...◊
  • Doesn't help that she's Gainaxing.
• (Bunny Maloney) Jiggle Physics: Applies to the women's breasts and Débilouman's nose.

• (Seven Mortal Sins) Gainaxing:
  • At one point during the Beach Episode, Lucifer's breasts bounce wildly when she calmly turns aside. What's more impressive is that her no-no bits remained covered, despite the fact that if her bikini isn't tight enough to prevent such a movement in first place then it shouldn't be able to prevent her breast from slipping off either.
  • This trope is the bread and butter of the X-TASY mobile game, as the character models - both the full portrait seen on the menu and cutscenes and the chibi version used for battles - are animated with heavy usage of Jiggle Physics so that the breasts are always bouncy.
• (Valkyrie Drive: Mermaid) Gainaxing:
  • Even when they're not moving that much, there's quite the bounce to a lot of characters' breasts.
  • Charlotte's breasts almost bounce out of her top just by walking.
• (Bleach: Thirteen Court Guard Squads 8-13) Gainaxing: Twice. The first was at the end of the Soul Society arc, when Hitsugaya scares her so much her chest almost flies out of her top. The second instance was in the Beach Episode, where she yells at Hitsugaya for not partying with everyone else.
• (Clue) Gainaxing: A rare live-action example — her first scene shows her breasts visibly bobbling as she dusts a room.
• (D-Frag! 2/2) Gainaxing: ...and in the anime they're quite prone to bouncing and squishing. That is relies on the example above it is not a point in its favor
• (Dungeon of the Endless) Gainaxing: Her breasts bounce noticeably in her idle animation.
• (Fairy Fencer F 1/3) Gainaxing: Among the Fencer girls, she clearly has the largest and bounciest breasts. Several of her animations not-so-subtly make her breasts bounce as well.
• (Fairy Fencer F 2/3) Gainaxing: Her well-endowed chest can be seen bouncing near the end of her Ulimate attack.
• (Fairy Fencer F 3/3) Gainaxing: The opening video for Refrain Chord shows her well-endowed chest bouncing.
• (X-Men Origins: Wolverine) Gainaxing: We have Emma Frost's slow-motion bouncing near the end before the helicopter.
• (He Is My Master) Gainaxing: Every now and then, Izumi's breasts bounce around while she's running.
• (Digimon Adventure 02 E 36 Steel Angel Shakkoumon) Gainaxing: It's subtle, but as Arukenimon angrily gets up to snap at Tapirmon, her chest jiggles.
• (Conker's Bad Fur Day) Gainaxing: The sunflower's and Jugga's jiggling breasts, and probably, the latter's name is a pun of that.
• (Trials of Mana) Gainaxing: Female characters in the remake have a little bit of bounce if they're showing cleavage (especially Angela). And so does Sylphid. Just enough context to end up here
• (X-Men: Children of the Atom) Gainaxing: Psylocke's breasts are drawn to bounce or droop depending on her posture and actions.

• (The iDOLM@STER) Gainaxing: Zigzagged in Episode 10 between Azusa and Takane. Found commented out
• (Arknights Guards A To M) Gainaxing: Her chibi has this unlike any other operators in the game.
• (Beware Thebatman 1/3) Gainaxing: Subtle, but noticeable.
• (Beware the Batman 3/3) Gainaxing: Subtle, but it's there.
• (Endless Frontier) Gainaxing: Seen often during her Super Move Portrait Attacks.
• (No More Heroes) Gainaxing: Desperate Struggle dramatically increasing her bust also led to a noticeable use of this.
• (Transformers Alter Verse The Seraphims) Gainaxing: Played with. Applies to the female Seraphim characters of this story (both main and supporting), especially the more well-endowed ones.
• (Unchained Blades 1/2) Gainaxing: Lapis has a sprite that has her bounce in... more ways than one.
• (Unchained Blades 2/2) Gainaxing: On her animated sprites showing her drawing her sword.
• (Mayo Chiki) Gainaxing Found commented out
• (Sword Art Online) Gainaxing: Though the anime is tame with Fanservice in relation to many others, there's still a bit of artistic mammary license seen on Sakuya and Leafa.
• (Mahoromatic) Gainaxing: In abundance. This is made by Gainax after all.
• (Digimon Tamers) After the Final Battle in Runaway Locomon one of the shots involve Sakuyamon being freed from the swamp of Combat Tentacles, or, rather, a close-up of her Breast Plate and the solitary Gainax of her chest as she's released.
• (Toumei Shoujo Ea) Gainaxing: The end credits feature a scene of Ea running towards the camera. Since she's naked this is pretty inevitable.
• (Agarest Senki 2) Gainaxing: Oh boy. Notable for the fact that even just a simple sentence, somehow the women must move their avatars just so they can get their point across complete with Gainaxing.
• (M.U.G.E.N Gainaxing:
  • Despite not bouncing at all in the actual Street Fighter games, Warusaki3's Rainbow Mika does this.
  • There is also one of the trope namers for M.U.G.E.N: Kabao & Warusaki3's Yoko Littner from TTGL.
  • Mugen has an entire community dedicated to NSFW characters that are simply this in a nutshell, albeit typically nude.
• (Vanguard Princess) Gainaxing: Every girl that's a bust size higher than a A-cup. Found commented out
• (Sanity Not Included 1/2) Gainaxing: Nina and Amanda are almost always bouncing around with nary a care.
• (Batman: The Brave and the Bold) Gainaxing: Zatanna in "Chill of the Night!"

• (Tropes I to P) Pec Flex: A non-comical version at the end of Descent where Guts is fighting ghosts in the field, he jumps to attack and his pecs gainax upon landing. Serious a scene as it as, the display did not disappoint. Put here because it seemed the best fit, even if I don't know whether it was intentional. Also, that it assumes the trope is usually played for comedy is telling...

• (Things Mr. Welch Is No Longer Allowed to Do in an RPG) All Men Are Perverts:
  695. Buying the Elf Babe a trampoline and telling her it boosts her Dexterity isn't fooling anybody.

• (Beware the Batman 2/3) Ms. Fanservice: She sports a tight, midriff-bearing, Gainax-approved outfit.

• (Dislyte: Esper Union) Gainaxing: Her animations do a fair bit of this to show off her large chest.

• (Anime & Manga) When Yuriko says she's gotten bigger in episode 6 of Kotoura-san and bounces her breasts in front of Dai'chi, he nonchalantly says that she must have gotten fatter.
• (hololive Indonesia) Ollie returns from a break and mentions that she's gained weight. She then reveals her buxom overlay and it can bounce. It can also bounce faster — so fast that it "flies off".

• (Strong Drinks) James Bond drinks vodka martinis, "shaken, not stirred."
  • Ian Fleming explained this preference by noting that it really only mattered if the bartender were female. Shake it!

• (Plus-Sized Elf) Gainaxing: It's a common trait this manga has. All the Mon-Girls have certain parts, mostly their stomachs, that jiggle to display their weight issues.

• (Skin Horse) Gainaxing: Not that you see it, but Nick apparently knows the term.

• (Anagram Bin 1/2) Public Bathhouse Scene
  • Epic bounces, blush heat.
• (Anagram Bin 2/2) Castlevania: Judgment
  • I am Velnandes. Tact? Jug?
• (Real Life) Studio Gainax
  • Gainaxing
• DeadOrAlive Considering how Kasumi is now a guest star in Razor's Edge, and perfectly capable of committing the same bloodletting violence as Ryu and Ayane, this Troper thinks it's some Foreshadowing that DOA6 will have scenes that are Bloodier and Gorier to match. Granted, there probably won't be any fatalities in any in-game matches, but the story mode can easily escalate in serious violence and drama onscreen, especially towards the climax. Bonus points if the other, non-ninja fighters get caught up in the whole mess in the worst way possible...
  • Surprisingly, Confirmed! What little has been seen of Dead or Alive 6 proves that it is already establishing itself as Bloodier and Gorier (albeit in a Downplayed sense, in that the worst shown (so far) is fighters sending blood flying with their hits, usually ending matches with visible bruising on their faces (subverting Beauty Is Never Tarnished), and that some characters (namely the ninjas like Kasumi, Ryu and Hayate) use various weapons in addition to their martial arts), and that the tone is more "serious" than the previous games, including downplaying the sex appeal from "cartoonishly exaggerated" to "still attractive, but won't be for long in a full-on fight". Of course, this all depends on whether or not Team Ninja doesn't roll back these changes in the wake of an outcry from the fans like they did LAST TIME with their "I'm A Fighter" campaign in Dead Or Alive 5, so take it with a grain of salt... Here because it doesn't fit anywhere else