When one's crap, AKA a deuce, is so big it cannot fit down the toilet pipes. It is neccesary to break, or chunk, up the deuce so that it can flush properly.
I ate some wicked Mexican food last night, and had to chunk up the deuce... twice!
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.