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.
The act of greeting another person, basically saying hello in a more ghetto fabulous way. A deuce is chucked when you hold your middle and index fingers like a peace sign, sideways with knuckles showing to whomever you are greeting.
Great way to show respect, say hello, greet anothe from a distance.