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A poop crayon is a poop that is used to write on the walls of a narrow bathroom stall. This usually happens when some emergency occurs when the poop is part of the way out your bum- you stand up, bend down, move around and meanwhile your half-extruded poo is writing all over the walls.
Once I viewed the stall smeared with poo, I formed my poop-crayon theory.
by no thanks October 09, 2003
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Poop Crayon - (Noun)
A Poop Crayon is a small piece of fecal matter that is stuck in the anal cavity that continues to write on the toilet paper when you wipe. Poop Crayons are extremely troublesome especially when you are in a rush.
"Sorry I'm late, I had a poop crayon and couldn't get my butt clean!"
by idontknowmuch March 09, 2017
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