Sexual act of fucking someone in the anus. Common sexual practice between homosexuals and hetrosexuals. Is also used as a form of birth control. Is considered more stimulating than reguular intercourse due to the fact that the anus present a tighter fit for the penis. In women it presents a feeling of being more "filled". May be done is various sexual positions but most common is the "doggie style" position. Commonly termed: " Taking it up the ass".
Susie cums much quicker when she is ass fucking.
or
Frank can give me an ass fucking anytime he wants.
by Renown February 22, 2008
when a male is behind his female partner, who is usually bent over, and shoves his penis in her vagina and begins to fuck her. can be very painful for her.
I walked in on mary and larry last night..he was ass fucking her and she actually liked it!
by lizabeth_x3 September 21, 2007

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