A person of significantly low mental status, originating from douche bag. The letters are switched to signify that the person being insulted is even more retarded than a douche bag.
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.