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1. Any kind of rear entry sex wherein the man slams into the woman's ass.

2. To have doggystyle sex (can be either vaginal or anal).

3. Simply fucking her from behind.
Dude 1: Man, look at that ass!
Dude 2: Yeah, I just want to spin her around and beat them cheeks.
by jacky_boy September 15, 2009
To have anal intercourse with a girl not a guy. (See "Gay ass pounding")
Damn dawg last night I was with Amy and I beat them cheeks.
by Jackaria July 15, 2006