Mas o que é isso aqui translates from Portuguese as 'but what is this here?', and the clip circulates mainly as a Brazilian meme reaction sound on soundboards and short-form video platforms. Its appeal is its universality: the speaker's bewildered tone needs no translation for viewers to grasp the joke, even if they do not speak Portuguese. Creators reuse it whenever a scene turns strange or hard to explain, which keeps it in rotation for reaction videos, comedy edits and livestream highlights. The phrase itself has become a shorthand for playful disbelief online.