Falei falei comes from Portuguese, where falei is a past form of falar, to speak, and the doubled phrase is used online as a shorthand joke about saying something over and over. Short voice memes like this spread through Brazilian social feeds, group chats and soundboards because the meaning lands even without context. Its six second loop is long enough to build the joke but short enough to replay, share as an MP3 and reuse in edits, which keeps it circulating as a reaction sound.