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Another word for pillow biting: rough anal sex. Typically a phrase describing the act of man-on-man gay sex, doggystyle notably; where a guy is on all fours and is getting pounded in the ass, the sheer force and agony of this is causing him to bite down on the pillow.
I tell ya, sometimes going to the dentist is worse than biting pillow.
by BLACK'S THE NAME February 19, 2011