Anything that is Oklahoman, such as clothing, food, even the accent is directly descended from Texas, which means Oklahoma has no culture of its own.
Similar to calling Canada "America Junior", this is an offensive term to the Okies because, like Texans, they are very pompous when it comes to their state.
Nat - "Why waste our time? Oklahoma is Texas Junior. Anything in Oklahoma is a copy of Texas."
Fred - "Good point."