geffin it 

to rock at doing sumthing. (slang for "getting it")

yo mayne, that fool is geffin it with those moves.

geffin it by word2yomother August 26, 2008

Giffin it 

The act of masturbating in class; also known as classterbating.

That kid was giffin it to that red-headed-chick and got caught by the teacher and got written up..

Giffin it by That kid getting his D WET April 11, 2009