The rimshot comes from vaudeville and early stand up comedy, where a house drummer would punctuate a comedian's joke with a snare and cymbal sting. It became known as ba dum tss from the sound itself and moved into radio, television sitcoms and cartoon sound libraries. Online it turned into a universal shorthand for a bad joke, used in memes, edits and soundboards whenever a pun needs an audible eye roll. Its short length keeps it instantly recognizable across languages and contexts.