The phrase is Brazilian Portuguese slang, with que isso roughly meaning what is that and vey a casual form of address similar to man or dude, which helps explain why the clip travels so well in short-form comedy. Shared as a standalone reaction sound, it has become a handy shorthand for disbelief in Portuguese-language meme edits and in videos where the visual joke needs no translation. Its short length and conversational tone keep it reusable across gameplay, reaction, and everyday fail clips.