Stands for "God Damn Goon." Represents someone who appears to be a big time goon.
Carrot Top is a GDG. Most typical Pittsburgh yinzers are GDG's.
by JT Dice May 31, 2007
a Get the D**k Girl. Meaning that a girl is good for a one night stand, but not a long term relationship.
Man, she is annoying but shes still a GDG
by Mature513boyyo May 01, 2010