The Tahoe strain came from Ocean Grown Kush, which is the original, but its been bred in Tahoe for many generations and now has it's own characteristics unique to Tahoe. Swerve, the famous tahoe grower at the time(1995-96), was given the cut from the creator of Ocean Grown Kush, Putz, who lived in Sunset Beach... hence Ocean Grown. It's a cross of Chem Dog, and Putz's own male, secret ingredient (elite cut from Lemon Thai X Old World Paki Kush). Putz, however, had created the first generation of this cross in 1993 and by '95 the strain had started to gain popularity.
In '96 Putz got married and move to New Zealand. He had been breeding the strain for a while and had some pretty stable seeds. He gave good amounts of these seeds to a few of his friends in the LA area. One of these friends sold a bunch of the seeds to growers in the San Fernando valley region and they started to grow and stabilize their own OG Kush that was slightly different than the original Ocean Grown Kush from Putz. They hence named it Original Gangster Kush.
I really did used to like OG Kush back in the day... but now it's whatever to me. So many people say they have it, when they don't. If you've smoked some OG you exactly what it is, and what the high is like. I just got bored of it. Hell, I smoked Lamb's breadth a year because of how fun that high was, but it got boring to me as well. I think it's stupid how much hype that it's getting now, but whatever... GDP used to be the shit (funny enough apparently that's clone only too), and now people don't like it anymore. I'm thinking the same thing will happen with OG eventually.