In the age of Hi-Dif porn, one will occasionally observe a single missed vaginal or anal-area hair on a female pornstar's otherwise shaved pubis. Much like the single hair on a Dr. Seuss character.
"Yo that video was hot, but did you see that girl's Dr. Seuss Hair? It was all by itself!"
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The result of an improper angle of approach when wiping your ass from a particularly messy poop-session. Poop gets on your knuckle. Usually occurs when you lift a cheek to the side and attempt a wipe.
Steve liked to lean to the left when he wiped his ass. This often resulted in a nasty case of poop knuckle.
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