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1.
A sexual position while in an orgy, in which you and your best friend try to avoid seeing one another’s penises by having your backs to each other. In the process you bump rumps one to many times causing each butt to become raw and bleeding and thus you are now blood brothers.
The Raw Hiney Hump is a pain in the ass, even hours after you're finished.
by Bionic Chinchilla January 09, 2012