Sem colete comes from the LeonardoLimaLive Twitch community, where short live moments are clipped and reused as meme audio outside the original broadcast. The phrase is Portuguese for without a vest, so Portuguese speaking viewers instantly get the joke while others use it mainly for the urgent delivery. It circulates in the same clip culture as other Twitch reaction sounds, shared between streams, edits and soundboards as a quick way to call out someone playing exposed, trolling a teammate or taking an unnecessary risk during a live match.