Used other than figuratively or idiomatically: see in, pocket.
(music slang) Alternative form of in the zone, playing perfectly in time, perfectly in sync with others, or with a perfect groove.
Hell yes, use that take. She was in the pocket.
(colloquial, derogatory) Alternative form of in one's pocket.
No, you can't count on him for the environmental bill. He's in the pocket of Big Oil.