g3g 

one more than g2g, the common phrase used on AOL to indicate that the person must leave (as in "got to go"). Except this is one better.

Just like how the numbers go to eleven.

I g3g run to the grocery store. I need more food, man.

g3g by the norgate February 22, 2004

G3GM 

A 3rd generation A-body car, made by the General Motors company.

a 1976 Malibu, a 1973 Chevelle, a 1974 Cutlass, all these are G3GMs.

G3GM by 76Malibu December 8, 2010