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1.
a log of shit that "draws" on the inside of the toilet when you flush
i could have given my toilet to the museum after that poo crayon
by progun December 04, 2008
 
2.
A slang term for the tip of a turd popping out your ass and "writing" on your underpants or panties.
i was prairie dogging earlier and now i've got streaks from the poo crayon.
by Chuck Bucket February 17, 2005
 
3.
A small slender piece of poo that you can easily hold and draw with like a crayon. You can even wrap some paper around it to add to the effect.
Tara loves to write on Ryan's chest with a poo crayon
by Joemaster Bates June 03, 2009