The phrase comes from informal Spanish slang, where saying someone is loco is a common teasing way to call them crazy. Clips built around short, repeatable lines like this spread mainly through WhatsApp voice notes, TikTok edits and meme pages, where a one or two second reaction is easy to reuse. Its appeal is not a famous scene or celebrity, but the recognisable delivery and the way the wording sticks in your head. That is why creators keep using it as a universal reaction for nonsense, surprises and bad decisions online.