when you fart with your bare ass directly on a person's face.
typically and most easily performed when victim is unconscious.
the fart should saturate the nostrils enough to leave a sharp resinous tang for a few hours, or until victim is conscious.
Friend who wakes up in the morning says: "Yo, why does everything I eat taste like shit?" or "What the fuck? Who the fuck farted in here?" or simply "I feel dirty."
You: "That's cuz when you were out I farted right on your face bro."
Friend: "Seriously dude? We said no atomic skittles last nite."