An abbreviation for:
— Gangsta Disciples, Afro-American street & prison gang
— Geometry Dash, rhythm/platformer video game
— “god-damn”, term used colloquially
— “good day”, common greeting
— “Green Day”, American punk rock band
— “Grateful Dead”, American rock band
— Guangdong, Chinese Provence
Have you seen a GD sign in your life?
I made a rated GD level.
That GD baby broke the toaster.
GD fellas!
I went to a GD concert last Tuesday.
I live in GD.
GeneticalDifference -- The innate limit on one's maximum potential skill in any given activity. It also describes the rate at which a person can learn or improve. Often used to explain why some people excel effortlessly while others struggle despite their best efforts.