Sustained use of sus clapping comes from the wider sus meme that exploded around Among Us in 2020, when players shortened suspicious to sus and used it for anyone acting guilty. Creators carried that joke into TikTok, YouTube Shorts and Discord edits, pairing slow claps and snickering laughs with screenshots, gameplay and reaction clips. The format stuck because it needs no context: a deliberate clap signals fake praise, while sus marks the target as caught out. It remains a compact reaction for edits about lying, cheating and cringe excuses.