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1.
To dance dirty with a girl or a boy, at a party for example.
"hey joe, did you go to that party last night?"

"yeah dude! I grinded with Jane!"
by Breezer1992 October 05, 2008
 
2.
to press together and move with a rotating or back-and-forth motion
In this day and age, i seriously think that if a woman asked me back for coffee then 9 times out of 10, i would presume that coffee beans would not be the only things that would be grinded. Or- She grinded her hips against my....
by ELFIS September 07, 2011
 
3.
came about through playing too much of the Tony Hawk's Pro Skater games (that's a skateboarding video game ladies and gents) and realising that "I did a grind" was too awkward to say.
I grinded that rail then did a kickflip onto the tabletop
by Matt Rowe November 16, 2004