The phrase comes from everyday Rioplatense Spanish, where pavote is a teasing insult for someone acting foolishly, and quien fue simply asks who did it. As a short audio clip it circulates on soundboards and in meme edits as a quick blame reaction, especially in Spanish speaking online spaces. Its appeal is the combination of a familiar scolding tone and a very short runtime, which lets editors drop it into gaming clips, chat replies, and fail compilations without explaining the joke or setting up any extra context beforehand.