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2.
Grinding with a friend(s) of the opposite sex just to have a good time not in a sexual way . Typically happens at school dances
Oh they were frinding at homecoming in Saturday they were having a lot of fun
by $noopsh October 07, 2013
 
1.
To friendly grind.
Chris: Dude, you were all over Heather last night on the dance floor.
Alex: Ah man, it wasn't like that, we were just frinding.
by AO, C^2 and Little Bear February 27, 2011