Little is documented about who first recorded this phrase or where the original voice note came from, so its history is mainly in how it circulates online. The line blends everyday Brazilian slang, with fi used as a casual way to address a friend, and hoje é dia framing the moment as one for letting loose. Shared on soundboards and in WhatsApp style exchanges, it has become a short shorthand for a mischievous plan, matching the idea in its listing of a day for being a little naughty rather than serious.