Gaston is the boastful hunter and villain from Disney's Beauty and the Beast, and this clip comes from a fan-made YouTube Poop edit titled Gaston's Ultimate Mission to Obtain Some Taco Bell. YouTube Poop edits re-cut familiar cartoon and film dialogue into absurd, fast-paced jokes, and short lines like this one travel well because they are instantly recognisable even out of context. The Taco Bell premise adds to the comedy, but the I know line itself survives on its own as a reusable reaction for confident, knowing or sarcastic moments online.