The word sus, short for suspicious, became widely used online after Among Us surged in popularity in 2020, when players accused each other of secretly being the Impostor. Short audio clips built around that joke soon spread across TikTok, YouTube Shorts and meme pages, where creators used them to flag anything that looked guilty or out of place. The humour works because the reference is instantly recognisable, even to viewers who have never played the game. That shared understanding keeps the sound in regular use for edits, reactions and gaming highlights.