a person occupying homestead land, as formerly in the western U.S., before the authorized time for doing so, thus gaining an unfair advantage in choice of location
Informal a person born or living in Oklahoma
Origin:
< compar. of soon
See sooner in American Heritage Dictionary 4
noun Slang
A person who settled homestead land in the western United States before it was officially made available, in order to have first choice of location.