Top definition
(noun)
1. Fecal residue left on the inside of one's underwear after an anal emission. See skidmark.
2. An accurate description of the physics involved in which a piece of leftover crap hanging out of your bunghole "scratches" your drawers.
Jimmy discovered a poop scratch in his boxers after not finishing the job a few hours earlier.
by Randman January 08, 2007
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