The phrase comes from everyday Brazilian Portuguese slang, where burro is used for someone acting foolish and giving zero is a blunt way of scoring a failed effort. It has circulated online as a short, user-shared reaction clip rather than as a line from a known film, show or song, which is why it travels so easily between edits. Creators reuse it because the judgement is instantly clear even to viewers who do not speak Portuguese: a bad attempt deserves nothing. That simple, universal scorekeeping keeps it useful for fails, roasts and game clips.