Sus comes from Among Us, the social deduction game by InnerSloth released in 2018 that exploded in popularity in 2020 as streamers and friends played together online. In the game, players debate who the impostor is, and sus became the quick slang for suspicious, used to accuse someone without a long explanation. The word then spread far beyond the game through TikTok, YouTube and Discord, becoming a general joke for any shady behaviour. Its short, instantly recognisable meaning keeps it useful for memes and reaction edits years after the game's peak.