Fui circulates online as a short WhatsApp audio rather than a clip from a known film or show, with no confirmed original speaker or recording date. In Portuguese fui is the past tense of to go, used in everyday speech to say I left or I am gone, which explains its popularity as a quick exit line. It spread through forwarded messages, group chats and soundboards, where short reaction audios are saved and reused out of context for comic effect in new conversations.