The word sussy grew out of Among Us slang for suspicious, where players accused crewmates of acting like the impostor, and it later spread across TikTok and short-form video as a playful label for anything shady or odd. This clapping version leans into that joke, using applause as an ironic reward for someone acting suspicious rather than impressive. It has stayed popular because it needs no explanation, works in a few seconds, and fits reaction edits, gaming clips and comedy skits where the punchline is simply that someone looks guilty.