Real Gangsta - someone who lives in the projects, is ususally in a gang, not very wealthy--often, but not always, black
Fake Gangsta - most males who attend North Warren (thank god i don't go there anymore). White kids from a rural town who listen to so much rap that they think they're black, act like they "slang dope" all the time, and would have no idea what to do if in a real projects. Yet, they still think they're hardcore gangstas.
John lives in the projects and is a Crip; thus, he's a gangsta. Eminem, though white, is also a gangsta, since he did grow up in a poor area and had what would be considered a gangsta life.
Kevin lives in an upper class white neighborhood in rural western New Jersey. He's never seen a housing project, except in videos on MTV, and probably has never even met a black person. This does not prevent him from acting like he's 50 Cent, however.