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When performing anal on a male or female that has not properly wiped and by the time you are finished there is a crusted ring around your shaft. Due to the seamen and shit.
"Did you smash that ass brah"
"Yeah but I pulled out and it smelled awful, then I looked down and saw a crusty ring!"
The ring of poop the collects under the head of the penis after anal sex.
Not to be confused with poop noodle
Damn, that girls poopy butt hole left me with a Crusty Onion Ring.