If you give a girl (or a guy) an ass rimming, and you've opened their anal cavity so far, what you will have once you are done is a circle of shit around your face and chin. This is whats known as a shitache. (Like a mustache, but made from shit)
I gave this girl such an ass rimming, when I had finished, I had a shitache.
by Nema March 29, 2006

5 Words Related to shit ache

A pain in the stomach from an immense need to shit. Often used as an excuse to get out of doing things, in a way it's almost like the male version of period pain.
"Hey, dudes, I have to go. I have a mad shit ache."
"Fuck that dude, you are such a piker"
"I'm serious dude, I'm about to shit all over the place"
by Blaine Ray November 16, 2007

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