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The act of a woman grinding her teeth on the top of your penis during oral sex. The pain is excrutiating and sometimes results in bleeding. The reaction of the pain may result in involuntary donkey punching
Sally:I just gave my boyfriend The Grinder...

Bill:Oh how did that go?

Sally:He broke up with me and gave me a bloody nose.
by Ebonics Lad May 25, 2010