Definitions by Anykey Keyboard

Groining 

Humping with full-force. Groining is usually dry Humping an inanimate object vigorously just for shits and giggles.

nick: Brandon WTF are you doing to that punching bag?!?! (lol)

Brandon: GROINING!!! *humps punching bag vigoously*

Groining by Anykey Keyboard May 10, 2011