When hairdrying your hair, one hand (the hand you ruffle your hair with) gets warm due to the warmth of the air blowing out of the hairdryer, and one hand (the hand holding the hairdryer) is cold.
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.