The rimshot comes from live comedy and vaudeville drumming, where a drummer accented a comedian's punchline with a snare and cymbal. As short comedy moved online, the ba dum tss became shorthand for a joke that falls flat, used in sketches, reaction videos and meme edits to signal the flop instantly. Like a buzzer for a wrong answer, it lets the audience in on the joke, and its brevity keeps it reusable across formats, from stage routines to short-form videos and streams.