This is what OG really means...

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!

O.G stands for Original Gamer

On gang or on god or Overly Gay

OG is a slang term for someone who’s incredibly exceptional, authentic and old school. Usually a person called Chris.

Olive Garden - an American Institution

Short for Original...until Ice T made a song titled "Original Gangster" in the 80's which changed the meaning of OG

Original or Old Gangsta,
You have to be in a gang
Have a rep
And have been to jail or killed someone