jacking off in a corner
When someone periodically dissapears or leaves for no apparent reason or without warning during intense or important moments. Which then follows a question period of the persons whereabouts. When the person repeatedly disapears, the group assumes the person is an idiot and is most likely jackin'off some place.
Bob: Dude, where the hell is Adam.
Dan: No clue, probably jacking off in a corner somewhere.
Dan: No clue, probably jacking off in a corner somewhere.