Stands for Random Fucking Grenade. Like in COD when someone randomly throws a grenade, and it always happens to hit you.
by BrokenBlackWolf July 2, 2010
by JEHCMH May 4, 2008
"Let's play some RFG and sledge some buildings!"
by Tegrat July 10, 2009
by that1redguy July 11, 2008
by Crimson_Koala April 5, 2009