The phrase comes from everyday Brazilian Portuguese gaming slang, where duo means the two player partnership used in ranked queues and casual lobbies. Ele já tem duo is the answer given when that partnership is already taken, so the clip spread as a ready made reply rather than a line tied to one known broadcast or character. Its humor depends on shared lobby etiquette, which is why it keeps circulating in short gaming edits, group chats and reaction posts among Portuguese speaking players who recognise the situation immediately.