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.
About this sound
Brazilian Portuguese voice clip saying 'tava pensando isso aí não,' used as a funny reaction to deny you were thinking something obvious at all.
This is a short Brazilian Portuguese voice line where a speaker casually says he was not thinking that at all. The delivery is flat and dismissive, like an instant denial in a conversation, which is what makes it funny when the thought is actually obvious. Lasting just over a second, the clip cuts in cleanly and ends before it can be explained away. Placed after a suggestion or accusation, it turns a normal reply into a sarcastic reaction, letting the audio do the eye roll for the viewer without any extra context or setup needed.