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A shit while in a public bathroom, that you do not flush, knowing someone else will have to gag at the sight... crying, "Oh snap!" People who snap a duece are either proud of their mess and want witnesses or have a good laugh while shitting and thinking about the "Oh snap" moment that renders the stall useless until the cleaners get called in.
Andrew - "Why are you smiling coming out of the washroom? Did you snap a duece or something?"

Jonny - "Oh man, my shit was a weird grey color! I just couldn't flush it. The janitor probably won't believe it either! I can just imagine the snap on his face."

Andrew - "It does make you laugh a bit - snapping a duece."
by Double-jointed donkey October 18, 2017
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