A Jiggle Fart is when your butt flesh slaps together post-flatulence, producing a moist, meaty clapping sound
As Seth leapt off the couch to answer the door, his cheeks jiggled with such violent enthusiasm that a jiggle fart erupted—wet, slappy, and followed by a sinister puff of air that made the cat leave the room in silent judgment.
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.