The word sus exploded as slang for suspicious thanks to Among Us, the 2018 social deduction game by Innersloth where crewmates vote out hidden impostors. Streamers and TikTok creators turned calling someone sus into a running joke around 2020, and lines like this one spread as quick soundboard reactions. It sits alongside other clips from the game, such as the Among Us role reveal sound, and stays popular because doubting your friends is endlessly funny in any group setting.