1 definition by Anykey Keyboard
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*
Brandon: GROINING!!! *humps punching bag vigoously*
by Anykey Keyboard April 20, 2011