This trope is about the poor saps who vomit whenever there's even a slightly logical reason to. When they're disgusted, when they're in a vehicle, when they're on a roller coaster, you name it. Sometimes, if they're about six or younger or a dog, they might vomit for no reason at all.
This trope is usually played for laughs. You might say it puts the "gag" in Running Gag. It might also be a way to portray a character as gross (as in, "Eww, I have to sit on the bus next to the kid who barfs a lot!"). It's also inexplicably associated with nerds and with neurotic people (while nervousness can cause vomiting, many of these characters vomit for unrelated reasons and just happen to have a nervy personality). If a character Prone to Vomiting is a nerd and neurotic, you get a Sickly Neurotic Geek.
If the character is an animal or a baby, the trope is often played to portray them as annoying. It's also useful for the writers to have one of these characters around if they need to quickly have something disgusting happen or for a place to be off-limits (e.g. "Don't go in there, Alice threw up again!"). They'll also be the focus of any motion sickness joke whenever the characters go on a trip.
To qualify as this trope, it's not enough for the character to just have one thing that makes them vomit. For instance, if Alice is seasick, that's probably not this trope, but if she's seasick, airsick, and carsick, it probably is.
Compare Vomit Discretion Shot, Vomit Indiscretion Shot, Morning Sickness, Vomiting Cop, Character Tics, and Hairball Humor. Contrast Nausea Dissonance. Despite the name similarity, Prone to Tears isn't really related.
- Titeuf: This is the defining trait of Hervé which is even reflected in his nickname, Vomito.
- Calvin and Hobbes: This doesn't apply to Calvin now, but when he asks what he was like as a baby, Hobbes responds that he spent most of his time spitting up.
- In La Cité de la peur, Simon vomits every time he is happy. And he is often happy.
- In Knives Out, Marta Cabrera's compulsion to vomit whenever she lies is made into a running gag.
- Mr Creosote from Monty Python's The Meaning of Life vomits periodically. When he eats a mint, he explodes and covers everyone in vomit.
- One episode of My Family And Other Animals involves Mrs. Durrell adopting a dog named Dodo who throws up a lot, but unlike one of the humans, doesn't get seasick.
- Recurring Mad TV character Trina Moss, played by Mo Collins, almost always gets emotionally overwhelmed toward the end of her sketches—which prompts her to vomit. Her love interest, Michael McDonald's Jim Cockhurts, displays the same behavior. It's revealed at their wedding that they are brother and sister, and after the full realization hits, they vomit... and so does their dad.
- A couple of Kids in the Hall sketches involved this trope:
- In one, a police officer vomits at the sight of a dead body, then vomits at the sight of an expired parking meter.
- In another, a couple of coworkers would "darn near puke" at very mundane things, such as bus tokens, ringing phones, and the name Mel.
- In the Peter Alsop song "My Brother Threw Up on My Stuffed Toy Bunny", the singer's younger brother apparently throws up a lot and has apparently thrown up on his toy telephone and his teddy bear as well as the bunny.
- Misfortune Ramirez Hernandez, the young protagonist of Little Misfortune, vomits as a response to various player choices for her.
- Battle for Dream Island: Rocky's vomiting is his defining character trait. He rarely speaks and rarely contributes to challenges in any way that doesn't involve using vomit to his advantage.
- In Horrid Henry, Henry's one-year-old cousin Vera throws up so much he calls her "Vomiting Vera".
- The Loud House: Downplayed for Lincoln Loud who throws up when he eats something gross (as seen in "Brawl in the Family" with a dirty bagel and "Not a Loud" with worms) and when on the teacup ride (as seen in a Licensed Game) but is fine otherwise, even with seemingly more intense rides.
- Dil, being three months old, sometimes randomly spits up on things.
- Downplayed for Chuckie, who doesn't throw up as much as Dil, but he does when watching a swing move (as seen in "A Dose of Dil") and when on a roller coaster (mentioned in "Accidents Happen").
- The Simpsons has Wendell Borton, the sickly little pale kid at Springfield Elementary. In "Homer's Odyssey", Bart is afraid of sitting next to him on the bus because of his tendency to get car sick. (Otto driving like crazy certainly doesn't help.) When they make it without Wendell barfing, Bart gives him a congratulatory slap on the back... and that's when he throws up.
- South Park had Stan Marsh throw every time Wendy Testaburger would talk to him back in season 1. This went away not long after.
- Babies under four months often regurgitate the contents of their stomach, known as "spitting up", which is not forceful like regular vomiting.
- Some animals (like bees, cows, owls, and to a lesser extent cats) need to regurgitate their food (and other stuff they've swallowed) either as part of their digestive process or to get rid of indigestible things they've ingested.
- Completely averted with horses, who have no ability to vomit, which can be life-threatening if they've ingested something they shouldn't have.
- Cyclic vomiting syndrome is a chronic disorder characterized by bouts of extreme vomiting and nausea. People with this disorder vomit several times in an hour and episodes tend to last for days.