Chapéu de otário is a Portuguese expression that translates as a sucker's hat, a label for someone who has been easily fooled. As a short soundboard clip, it has circulated among Brazilian meme creators as a quick spoken put-down, fitting the fast, reaction-driven style of short-form edits and chat audios. Its appeal lies in its brevity and attitude: in just a couple of seconds it frames a moment as a joke at the expense of the person who fell for it, which is why it keeps reappearing whenever a prank, scam parody or gullible reaction starts trending online.