In girls, it's when they're rubbing their crotches up against each other.
Gawd, I was grinding with a chick the other day. It was so hot.
by qwertyuiop001 May 02, 2005
A repetitive task usually involved in a Massively Multiplayer Online Role playing game (MMORPG) where a character's skill's are based entirely on killing monsters to gain strengths or levels. In most MMORPGs, there is no skill from the player involved, so anyone who plays 20 hours a day of grinding will be stronger than a player who does not. MMORPGs become a game genre filled with those who are too slow to play First-Person Shooters (FPS) or too dumb to play Real Time Strategy (RTS) but want to brag and be 1337 g4m3r so they play 20 hours a day and boast to "n00bs"
me_is_n00b: Johnny, what level are you?

Grinding_Johnny210: I'm level 250+

me_is_noob: wow you are so uber 1337! You must be so good at this!

Grinding_Johnny210: Yea, it's pure skill.

me_is_noob: I wish i could grind like you, unfortunately, I have a life, a job, a car, a girlfriend..

Grinding_Johnny210: You suck n00b!
by dude112233 January 07, 2006
sellin drugz on da streetz.
keepin it real
"Yo what that niggah be doin?" "He be grinding on 13th and Cotton"
by playa February 17, 2003
Using a grinder to crush rocks of blow
Man I got this sack and started grinding.
by littleleileismu March 11, 2003
moving your butt back and forth with a weener between your cheaks
by ben thomas February 02, 2003
"grinding" is drug-world lingo for an informant going onto the street to identify drug dealers, who are then busted - and robbed - by the police.
Mosby provided information about which "hitters" were carrying drugs; King and Murray would "catch and release" the dealers, stripping them of their money and drugs. Then, according to prosecutors and trial testimony, the officers would illegally sell the drugs to Mosby at a discount. He in turn, he said, resold the drugs back out on the streets.

They called it "grinding," Mosby told the jury.

the officers "grinded" before or after their regular shifts, calling it their real work.
by sassafrass June 29, 2006
When you tell someone you were just "grinding" with a chick, but really she was giving you a handjob by the pool.
Beef and Lara were "grinding."
by The Geej March 28, 2005
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