Among Us is a social deduction game released by InnerSloth in 2018, in which crewmates complete tasks while trying to identify the impostor sabotaging the ship. The game exploded in popularity in 2020 through streamers and online play, and sus, short for suspicious, became its signature shorthand for accusing another player. The word travelled far beyond the game into TikTok, YouTube edits, and everyday jokes, which is why a few seconds of it still instantly reads as a playful accusation.