This clip circulates online as a Brazilian Portuguese reaction audio, built around a shocked scream and the repeated question que que isso. It is shared mainly through soundboards, short video edits and messaging apps, where the exaggerated delivery does the work of a facial reaction without needing context. The phrase itself is everyday slang for disbelief, which helps it fit almost any surprising moment. Its popularity comes from how quickly it escalates, turning confusion, fear and comedy into one short burst that viewers understand instantly even without speaking Portuguese fluently today.