1. When a drug dealer is running around town buying/selling drugs. "Hey, I cant go right now, im on the grind."

2. A vulgar dance where people rub their body parts against each other. Usually to rap or techno. "yo, check out that hoe over there putting her ass all up in that guys crotch...they are grinding."
by TheOneNOnly October 29, 2003
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A lesser known definition:

A form of musical composition when every instrument play repeatedly and rapidly, with unpredictable changes of stance in the beat.
Did you guys see Narcosis last night at the show? That shit was so fucking grind!
by TekFox February 1, 2004
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A skateboarding move, where a part of the skateboard is slid off a rail or edge.
That rail's one of the best for grinding.
by Mr. Misfortune August 22, 2004
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when a girl shakes and moves her ass on a guys crotch and the guy moves with her ass
Yo i was grindin on that ass last night
by Matt M. May 28, 2004
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whist dancing, a person, usually female, while rub her rump on the crotch of a guy. if timed right can lead to the male's orgasm. a form of a dry hump.
yo man, we was doin the grind out there, she can really shake dat ass of hers
by sum guy January 28, 2003
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A way of dancing that can be described as a feeling like getting punched in the balls with a really nice ass over and over and over and over again
Yo, Prom last night was Bomb! Me and this chick were grinding so much that my balls started to hurt!
by john doe deer May 15, 2011
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A form of the most horny dancing imaginable. Guys looking for ass will grind profusely with random girls in order to pursuade them to come home and get some bun action. Involves pushing the male genitalia up the ass of the female.
At the club last nite, I got hammered and was grinding with every girl in there...so much, that my package was sore the next day
by BONE May 3, 2003
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