A term describing a person who has totally lost their grip on reality. Such people are mainly from the right wing of the political spectrum, and are often politicians and religious extremists.
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.