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When you take a cool shaped shit, then freeze it and later, with a condom on it use it as a dildo or other sexually stimulating device.
"Aww kids! Look at this shit! It looks like a dick! Lets fuck my shit"

"OK Ma, I'll get the camera"
by fuck my shit May 06, 2008
Any kind of bad break or bad luck.
"Fuck my shit" his king high straight beat my jack high.
by joseph greiman March 03, 2007