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The act of having to use the sphincter to break apart a shit, in order to make it into a size that can be managed more easily by your shitty toilet.

Can also be used to describe the act of shitting.
"Where's the crapper, I gotta snap a deuce!"
by Brendon November 18, 2003
As above, but can be signaled by snapping one's fingers.
Snap fingers, leave index and middle finger extended after snap.
by C February 21, 2004