The butt horn has no single documented origin, and it circulates mainly as a user-uploaded gag sound rather than a clip from a film, show or game. Online, it sits alongside other loud, lowbrow comedy effects, sharing the same job as an MLG air horn for hyping a moment and a fart sound for making it deliberately crude. Creators reuse it because the joke is instantly clear without any context: a big honk means something ridiculous just happened. That simplicity has kept short, silly horn clips in rotation for prank edits, reaction videos and meme compilations.