The exact original source of this short clip is not widely documented, so it is best understood as a piece of online meme audio rather than a line tied to a verified film, show, or song. Its appeal comes from the phrase itself, which sounds like a relaxed, streetwise way of saying you already know, making it easy to reuse across languages and contexts. Shared in short videos and soundboards, it has survived because it is instantly recognisable, easy to place, and flexible enough to fit jokes, reactions, and confident replies without needing any explanation.