A sub-type of Psychopath. Used to describe someone who is the worst actor on the planet, who lies more that the more that a serial killer, and has the unique talent of shitting on command.
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.