1 definition by 7thgradeslut

Top Definition
middle schoolers favorite dance. When a girl moves her ass in the guys crotch. He gets all hard with his boner and its awesome for both of them. Especially when they both know what theyre doing.
Jen: Did u c william grinding her?
Eliza: Yeah u could tell he was having a boner the minute after they started.
Jen: it looked fun!
by 7thgradeslut October 16, 2011
Mug icon
Buy a Grinding mug!