The phrase comes from Brazilian Portuguese slang, where bichão is a boastful way to call someone the big shot and memo is a casual spelling of mesmo, meaning really. Online the clip spread mainly through WhatsApp audios, short video edits and meme pages as a ready-made hype reaction. Because the line is short, expressive and easy to understand even without context, creators reuse it across gaming, sports and everyday funny moments. It stays popular because it works both as genuine praise and as ironic teasing when someone acts overly confident.