This trope is pretty straight forward. A character receives some sort of trauma to their backside. As mentioned above this trope is often appears in slapstick or otherwise humorous context. This is because in addition to the fact that butts, particularly large ones, are often seen as inherently humorous and because butts are naturally padded if something or someone strikes it there's less likely to be any serious injury involved.
This tends to happen to plumper characters more often since their butts are naturally bigger targets.
A super trope to Rump Roast, Butt Biter, Literal Ass-Kicking, Anal Probing, Thumbtack on the Chair, Shot in the Ass, Ass Shove and Comedic Spanking. Contrast Butt Sticker and Ass Kicks You, where it's the butt that hurts someone else.
- The page image is from Disney's Hercules, where the introduction to Pain and Panic has the two bumbling henchmen tripping down a flight of stairs and Pain landing bottom first onto Panic's horns.
- Lampshaded in Disney's Moana. Maui is in the middle of a "The Reason You Suck" Speech to Moana, while denying her the ability to sail the boat they are both on. Moana just takes it, but the Ocean intervenes by sticking a blowdart (from an earlier encounter) into Maui's backside, paralysing him. Moana then takes control of the boat. (It makes way more sense in context.)
Maui: Blowdart. In my buttcheek. You are a bad, bad person.
- In Shrek, after a fight with Robin Hood and his Merry Men, Shrek ends up with an arrow in his butt. He doesn't even notice it until Fiona points it out and removes it.
- In the prologue of City Slickers, the three main characters are in Spain for the Running of the Bulls. The segment concludes with Billy Crystal's character Mitch getting gored in the behind.
- A mini arc in Everybody Loves Raymond featured Robert's injury in the line of duty when he was gored in the Upper Thigh Region by a bull that escaped from an illegal rodeo. Certainly made for a memorable arc because of the nature of how a police officer was downed and partially the embarrassment Robert faced when it was revealed that the by-standard footage went viral.
- This comedy mechanism has been discussed in the Big Cartoon Forum, here: . Granted, it's all Western Animation stuff, but posteriors get poked nonetheless.
- Ren and Stimpy has featured a couple of examples in their time. One unique one is from the Christmas special when Stimpy tries to fart for Ren. He strains so hard that his butt cheeks actually wind up deflating like a couple of balloons.
- Loonatics Unleashed has on three separate occasions delivered a low-level psionic zap to Danger Duck's tail, each time in response to some calumny uttered by Duck. It's a superpowered equivalent of a spank upon rude youngster. "Hey! Easy on the tail feathers!"
- When the villain captures the dune buggy of Josie and the Pussycats with a claw lowered from a helicopter, Alan, Josie and Alexandra fall out of the vehicle onto the ground. Alan and Josie are fine, but Alexandra, as the Token Evil Teammate and Butt-Monkey of the group, finds herself sitting on a cactus. The Team Pet Sebastian amuses himself by extracting the needles from Alexandra's tender tissues.
- Disney's theatrical short cartoons seemed unusually interested in Walt's cartoon animals' rear ends—and in particular, administering physical punishment to them when their owner is incapable of escape:
The Band Concert (1935) A passing tornado leaves Donald Duck trapped between two intertwined trees, his arms, legs and head facing one direction and his butt prominently pointed in the other. The tornado sends the band members, their instruments and assorted debris spinning in the air, and a particularly obese pig’s butt sliding along a picket fence, breaking off their pointed tops as he goes.
The Practical Pig(1939) When the Practical Pig catches his brothers lying, his elaborate mechanical lie detector scoops them up, firmly straps them in butt-upwards and paddles their exposed fannies glowing red. Earlier in the cartoon the camera (viewing from a low angle that suggests it’s eavesdropping on them) lingers on their butts as they squeeze into tight bathing trunks. (The shot is particularly curious in the fact they normally run about bare-assed to begin with.)
Donald Duck seemed particularly prone to wind up in this sort of situation. In Modern Inventions (1937) an automated barber’s chair turns Donald upside-down, ties a towel around his feathery fanny and tries to give his tail feathers an unwanted trim.
Window Cleaners (1940) While being hoisted upwards on a scaffold Donald’s tail feathers are clipped clean off by someone trimming their window plants, leaving the tip of his tail pink and featherless. (His feathers replenish themselves by the following shot.) The entire last half of the eight minute cartoon is devoted to Donald’s battle with a bumble bee that culminates with the duck completely tangled in the scaffold’s ropes, his butt fully exposed to the vengeful bee. The bee, himself exhausted by the battle, slowly summons his remaining energy to attack the helpless duck, allowing Donald plenty of time to fearfully await his impending punishment.