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The inexplicable force in some girls that causes them to grind on nearby objects (poles, girls, guys, animals). Located in the hiney or in rare cases the crotch.
John: Damn Gwen, turn down the Grind Magnet, you just traumatized the nurses at the convelescent home!
Gwen (while Grinding on John): I know, i can't help it! It never turns off!
by John319 August 19, 2007
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