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This is the act of pulling a chick's (or a dude's, if you're into that kinda thing) sphincter out of her bunghole after a session of dangerous, sloppy butt sex. After a chick has been spincted, she'll have to wear Depends, for sure.
"Wanda, why are you wearing an adult diaper?"
"Cuz some dude jumped me from behind and sphincted the shit outta me!"

"Man, it sure smells like shit in here!"
"That's me. I got sphincted last night, and now there's no difference between a deuce and a fart."
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