The phrase comes from Brazilian Portuguese internet culture, where short spoken audios are passed around as reactions and reused in short-form videos. Que num vai dar, rapaz roughly means that something will not work out, and the informal address gives it a familiar, streetwise edge that Brazilian audiences recognise instantly. Because the clip is only a few seconds long, it fits easily at the end of a joke, in a group chat reply, or over a clip of a plan going wrong, which has kept it circulating as a handy dismissive soundbite.