When one perches on the top of a tapped keg (resembling a gargoyle perched on the side of a building) and proceeds to let the beer flow into his/her mouth for an undisclosed amount of time.
12 step recovery jargon referring to someone new who talks about how great life is, now that they'resober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.