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A female that is part of a threesome of an already established couple. This girl isn't so much of a part of the threesome, but is what one would call the girl that does the dirty work, ex. licking butthole, cusping the testicles, lapping semen up off the floor.
Boyfriend says to girlfriend,"Oh that Ashley, she's really hot, can she be part of our threesome? "

Girlfriend, " Only if she's the clean-up girl."

Girlfriend says to boyfriend,"Damn it, there's semen all over my feet.

Clean-up Girl says, "Don't worry, I've got this."
by Mr.Ripley January 17, 2017
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