The Quem é Você sound effect is a short Portuguese voice clip asking who are you, used in memes and reaction videos to question someone's identity.
Quem é Você is a short spoken clip built around a single Portuguese question, who are you, delivered as a direct challenge to the person on screen. The voice is clear and punchy, with the emphasis landing on the final word, which makes it feel like a demand for an explanation rather than a casual greeting. That abruptness is what gives the clip its comic power, turning an introduction into a moment of suspicion, surprise, or playful interrogation. Viewers understand the setup even without subtitles, because the question itself does the work, framing the next scene as someone caught out, exposed, or pretending to be something they are not.
Quem é Você translates from Portuguese as who are you, and as a soundboard clip it circulates mainly as a short reaction sound rather than as a line tied to a widely documented film or television moment. Its appeal online comes from its simplicity: a single direct question that works across languages, edits, and contexts without needing setup. Creators use it to punctuate reveals, confrontations, and mistaken identity jokes, which keeps it useful for short-form video, streams, and meme edits where a fast, recognisable reaction matters more than a longer dialogue exchange.