Short for "I don't give a fucking shit", is rarely used but used when you're angry as fuk, or has massive boredom because of people constantly bugging you gossiping about a person or just doesn't care about a person's opinion on something.
Mary: Did you know that James slapped a girl in the face because of a argument about games causing violence?
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.