Means "Get A Fucking Yak" used in the MMORPG RuneScape.
Tom: Ugh i hate banking dragon bones. Lowlvdef: gafy noob.
by Lowlvldef August 15, 2010
Go And Fuck Yourself
I've had enough of your shit! GAFY!
by Chief Ops Guy and Master Pimp November 28, 2006