poop scratch

(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.

poop scratch by Randman January 9, 2007

sharp poop scratch 

when you poop it scratches you rectum if your poop is hard

ouch my poor butt. That sharp poop scratched my butt

sharp poop scratch by Suklaa March 11, 2017