A high, muggy, sweaty environment that is usully found when a large group of people are in a small area. Balls ass hot is detected by a person's crotch or anus. See swamp ass. Used to describe the temperature of a location, not of a person.
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.