An expression which denotes one's extreme affinity to a particular person or thing. The 'g' portion of the expression can be altered to closely associate it with the person or thing to create a humorous effect.
Tom: I cooked brinner
for my bros.
Mario: Brinner is my g.
Justin: Did you see the Blake Griffin highlights from last night's game?
Jesse: Not yet, but Griffin is my absolute g!
Luke: Jesse is definitely going to draft MJD in fantasy football.
Justin: Definitely. MJD is his MJ-G