The act of cupping your palm behind your ass in an attempt to "catch" the offending odor which seeps from the anus like a roving green cloud. Once properly captured, you then raise it to the victim's face while they have their attention diverted and open your steaming Christmas present with a flick of your wrist. Watch as your "friend" slowly drifts into a methane coma.
"wow bro, He didn't see that cuff nugget coming! He's going to taste that for days!"