Among Us, the social deduction game by InnerSloth, first launched in 2018 and exploded in popularity in 2020 as streamers and friends played it together online. In the game, crewmates complete tasks while trying to identify the impostor secretly sabotaging them, and calling someone sus became the community shorthand for suspicion. That slang spread through streams, TikTok edits and reaction videos, turning a short accusation into a widely recognised Among Us meme. It remains popular because the joke needs no explanation for anyone who has watched or played the game.