Little is documented about where 'cabeça grande da mulesta' was first recorded; it appears to be a user-uploaded soundboard clip rather than a line from a known film, show or song. The phrase itself reads like Brazilian internet slang humor, the kind of half-nonsense expression that gets passed around in meme edits and voice-note chains. It spread the way most small meme sounds do, shared from board to board and dropped into compilations until the line became a punchline on its own. Its staying power comes from pure absurdity rather than any famous source.