Delusions Of Grandeur
A D.O.G. is someone with the potential to have really big dreams but without applying oneself will end up just eating the dirt, metaphorically speaking.
A D.O.G. usually starts out very timid or perhaps somewhat of a spaz in social situations. They show all traits of an extremely bright but also very underdeveloped individual.
D.O.G. in a classroom: Dude I think I'm gonna go to college and get my AA degree or something. But then I'll want to work a good job too, I mean I don't want to flip burgers or anything like that. Maybe then I'll meet a nice girl with cute boobs and butt and go out with her and once I make enough money we'll be able to go on expensive dates and then we'll get married and have lots of babies. Hurray!
Other students: Okay whatever... (sigh)
P.E. teacher: Alright maggot give me 10 push ups
D.O.G.: But sir my arms hurt
Everyone else: OKAY JUST SHUT UP THEN PLEASE
From the mean streets of Harlem, starting around the time of Biggie. Short for "Damn Ol' Gangsta".
Shit homie, that nigga is a D.O.G.!