The ba dum tss rimshot comes from live comedy, where a drummer would punctuate a joke with a short snare roll and cymbal crash to signal the punchline to the audience. That stage trick moved into radio, television and cartoons, becoming shorthand for a joke that is meant to be groaned at as much as laughed at. Online, creators clipped the sting for reaction videos, meme edits and short-form comedy, and louder versions like this one became popular because they stand out over background music and commentary. It survives because the rhythm is instantly recognised even without any words.