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the trail of fecal matter that remains on the circumference of a toilet bowl whereupon one's fecal mass lands during the act of defecation

usually as a result of bad gluteus positioning during defecation; causing excrement to drag upon the toilet bowl

the name derives from the combination of two words: shit + skidmark= shidmark
I felt bad leaving shidmarks on grandmas toilet, so i flushed several time to get rid of them.
by Johnny Pham November 27, 2008
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Defecation that leaves behind skidmarks on the circumference of the toilet bowl

Shit+skidmarks= shidmarks
i took a massive dump, and left shidmarks on the toilet bowl.
by John Pham November 21, 2008
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