The 'OG' in OG Loc doesn't mean what most players think

OG Loc's real name is Jeffery, and his stage name's 'OG' is widely interpreted as ironically meaning 'Original Gangster' — a title he desperately wanted but was explicitly told by Sweet and Big Smoke that he lacked the credibility to earn. The gap between his manufactured image and actual background is central to his character as a wannabe gangster who went to prison for petty traffic violations just to seem hard.

Source: OG Loc's OriGinal — CC BY-SA