The word sus became internet shorthand for suspicious during the huge wave of Among Us play and streaming, when players constantly accused each other of being the impostor. From there it escaped the game and entered everyday meme language, appearing in reaction clips, edits and short videos whenever someone looked guilty or out of place. Sounds built around the word work because the joke is already understood, so creators can use a single suspicious moment to set up a reveal, a betrayal or an awkward pause without needing any extra explanation.