Slow sarcastic clapping has long been used in live comedy, classrooms and sports crowds as a mock round of applause, and the short recorded version spread online as a reusable reaction sound. Creators add it to edits, streams and meme compilations whenever a moment is meant to impress but falls flat, letting the bored applause do the criticising. Its popularity comes from timing rather than volume, because the drawn out pace signals disappointment more clearly than a single clap and works even with the video muted or paused on a face.