The ba-dum-tss rimshot comes from live comedy and variety performance, where a drummer would underline a joke with a short roll and a cymbal crash. As short-form video and meme editing grew, the same sting was lifted as a standalone sound effect and reused to mark punchlines, fails and deliberately corny jokes. Its meaning is now understood instantly without any setup, which is why editors still reach for it whenever a clip needs a clear, old-school comedy ending.