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
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A chick that likes grinding her pussy against you.
She ground her meat curtains against my leg, getting it all wet! What a grinder!
by King May 15, 2003
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A pejorative term for a Slovenian-American. From the German word Krainer, a person from Krain, the German name for the Austro-Hungarian province of Carniola in modern-day Slovenia. Prevalent in the Great Lakes region, the Midwest and Appalachia. Variations include griner (GRY-ner), krainer (KRY-ner) and granish (GRAN-ish), from Krainische, meaning Carniolan. Granish is specific to western Pennsylvania.
Bridget married some grinder from Collinwood.
by Primorec May 15, 2008
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A rough-looking person who hangs out in rough neighbourhoods and doesn't do very much. Likely to make trouble.
Lotta grinders trying to get freebies at this McDonald's today.
by lottagrinders March 22, 2013
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A player in massively-multiplayer online (MMO) games that is content to complete mindlessly repetitive tasks in order to increase an arbitrary number within a game to "level up".
Player A: "Hey, QuidditchKid792. How did you get your level up so fast from last night? You must have gone up three levels!"

Player B: "My friend is a grinder, and he leveled me up all last night in exchange for some Tier 6 equipment."
by the400rabbits December 9, 2009
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some one who is into the metal subgenre grindcore
Napalm Death are fucking hardcore grinders man!! they practically invented grindcore!!
by JTLC January 3, 2005
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