Tom left a $1 tip on a $30 bill at a restaurant. James looks at him and says, "Why you chinsing out on the tip, man? You have to leave at LEAST 15%..."
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.