When I would tell my friends that I’m moving to Oklahoma, they would ask,
“So you’re going to the Sooner state?” or “So you’re going to be a Sooner?”
I would nod and say yes, but I had no idea what a sooner was. So I did some research and found the answer at mentalfloss.com. Here’s what they say:
It seems that many settlers entered Oklahoma before the legal time for settlement in April 1889, thereby beating out any law-abiding suckers who followed the rules and moved in on time. Soon after, “Sooner” came to mean both an Oklahoman and anyone who jumps the gun.
In case you were ever wondering, now you know.