The ba dum tss, also written ba-dum tsh, comes from the live drum sting used by stand-up comedians and vaudeville performers to mark the end of a joke. Drummers played it in clubs and on early radio and television shows, where the two beats and cymbal became shorthand for a completed punchline. As soundboards and meme editing spread online, the short sting was clipped, shared and reused everywhere, and it remains the universal audio cue for corny humor and intentional awkward pauses.