OG- Original gamer.
Anyone who remembers the day where you would sit on your couch and play original Nintendo while your grandma cheered you on from the love seat while smoking a cigarette. If you remember these times like they were yesterday because you still play these games, then you are OG. Son!
Justin: Yeah man, lemme get my grandma and her pack of cigs and we'll boot up some Mario 3 Sucka.
This usually refers to an old gangster (past his fighting days) who has retired, more often than not as a successful man. Originally used in the 1970s.
gang member #2: damn! shit! dat's whack!