Sharpie Ass
When you wipe your ass over and over but the toilet paper keeps coming up shitty, as if you were wiping the tip of a sharpie.
"Sorry I took so long in the shitter bro, I had sharpie ass."
Sharpie in his ass
Can be used in any situation but mostly about people who are mad or look mad about something.
Scott- "Look at Mr. Sand he's acting like he has a sharpie in his ass or something."