Ass Crayon 

The resultant fecal protrusion as result of fighting off the imminent need to defecate, that has moved beyond the turtle head stage. Ambulatory movement while in this state results in the subsequent movement of the Ass Crayon, thus creating a abstract expressionistic piece of art on the inside of the persons underwear.

Not wanting to crap in the pub's gnarly toilet, Drew knew his wiggling Ass Crayon would make quite a masterpiece as he waddled his way home.

Ass Crayon by teh collective January 13, 2010

ass crayon 

When a woman is passed out, either from her own actions or by way of your rufies, the act of fucking her in the ass wildly and then drawing doodles on her sheets using your feces-stained penis.

These actions may be repeated until said drawing is complete.

That passed out bitch didn't appreciate that I ass crayoned her bed.
- or -
I have a wicked yeast infection in my foreskin from using my ass crayon too much.

ass crayon by scorpionmintred December 28, 2003

Ass Crayon 

An anomaly during the act of defecation in which your sphincter clamps tightly around fecal matter, resulting in the requirement of wiping your ass until your brown-eye bleeds profusely.

I'm sorry I'm walking a bit awkwardly today. I had a horrible Ass Crayon this morning.

Ass Crayon by Orion20 January 3, 2010

crayon-ass 

A person with a crayon for an ass, or, a person who has surgically or naturally attached a crayon to their ass.

Hey crayon-ass! come draw me an effing picture!

crayon-ass by Richard Baxter March 26, 2009