The phrase is everyday Brazilian Portuguese, roughly meaning I was not thinking about that, and the clip circulates online purely as a short reaction audio rather than as a known movie or show quote. Its humor comes from timing and familiarity, since the line sounds like something pulled straight from a casual voice note. Short Portuguese denial clips like this spread easily in group chats and meme edits, where a familiar spoken phrase can replace a typed reply and instantly set a sarcastic, caught out tone.