McLovin is the fake name used by Fogell, the awkward teenager played by Christopher Mintz-Plasse in the 2007 comedy Superbad, and the name has since become shorthand for an overconfident outsider trying to look older. Ya lo sé translates from Spanish as I already know, which makes the clip useful far beyond any single scene. Shared through meme soundboards and short reaction edits, it survives because its meaning is immediate, its tone is lightly sarcastic, and it fits any moment when someone states the obvious.