The line comes from a comedy video by Brazilian creator Nadsongl titled 'O professor que reprova por 1 décimo', in which a professor fails a student by just one tenth of a point. That tiny margin is what made the phrase stick, because it captures the frustration of being almost good enough. Shared as a short clip, it is now used far beyond school jokes, as a quick verdict for any near miss, failed attempt, or disappointing result that feels unfairly close.