The act of releasing gas from ones anus, which is usually accompanied by a foul smell. Can be used as an excuse or a weapon.
Sorry mom, I cant go to the reunion today, my stomach is upset. If you dont believe me, smell one of my farts.
Guy 1. Hey, get off my Beer
Guy 2. No way man, you lost it.
Guy 1. Ill Fart on you.
Guy 2. OK man take it.