The act of having your penis accidentally slip out of a vagina during intercourse and then, in an attempt to re-enter the vagina, entering the anus.
"The sex was going good until I moon-stiffed her and then we both screamed."
"Damn, moon stiffing sucks."
"Damn, moon stiffing sucks."
by BobbyGoodrapes April 30, 2014
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moon stiffing
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