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
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.
The ultimate friend, GDGs are usually found in the wild combatting Duendes. They are the sole protector of humanity against the midget scum. They are especially loyal friends and good-hearted people, so much so their moral compass is sometimes a pain in the ass. One of them gave me 200$ once.
"GDG stop sending scrotum picks!!"