Jaguara comes from Tupi influenced regional speech in southern Brazil and has long been used as a joking label for a rascal or a good for nothing character. Shouted with the words é um, meaning it is a or he is a, it turned into a short catchphrase that travels well as audio. On soundboards and in Brazilian meme edits the clip is shared as a quick voice reaction, passed around in chats and reused whenever a punchline needs a familiar local insult delivered with comic timing instead of anger.