FURK is an acronym for "For Unlawful Rectal Knowledge". FURK is when a man is having sexual intercouse with a woman from behind or doggy style in her vagina, and with one quick motion puts his penis in her anus and plays it off as a total accident. A man will FURK his woman in an attempt to see her reaction to anal sex.
Dude I FURKED my girlfriend last night and she squealed like a pig and flipped out on me!
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