OG = Original Gangster, kommt aus dem Hiphop (war mal ein Albumtitel) und heißt inzwischen einfach "das Original, der ursprüngliche, echte, erste.
Edith hat nachgeguckt, es gab den Begriff wohl schon vor dem Album, das Album hat nur geholfen, ihn zu verbreiten.
NOTE: According to an essay by Steve Champion and Anthony Ross, former members of the Crips street gang in Los Angeles, the initialism O.G. was first used by the Crips in the early 1970's; see Champion and Ross, "The Making of an O.G.: Transcending Gang Mentality," written in 2006 and available on the website indybay.org as of 7/12/21. The release of the album O.G. Original Gangster by the rapper Ice-T (Tracy Lauren Morrow) in 1991 likely contributed to the migration of the word from gang culture to more general use.
OG
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noun
ˌō-ˈjē
variants or less commonly O.G.
pluralOGs also OG's or O.G.s or O.G.'s
slang
: someone or something that is an original or originator and especially one that is highly respected or regarded
https://www.merriam-webster.com/dictionary/OG