The line works online because it sounds like a universal excuse for leaving, so creators have reused it as a short reaction sound rather than tying it to one specific scene. Its appeal is in its confidence and finality: it does not argue, explain or apologise, it simply ends the interaction. That makes it easy to drop into short-form videos, streams and group chats whenever someone wants to signal that they are done, busy or moving on. As a one-second clip, it also fits neatly at the end of edits without needing extra context.