Is it ensure, insure, or assure?
"migrant agricultural worker," especially one driven from farms in Oklahoma during the Dust Bowl, 1938, short for U.S. state of Oklahoma.
"Okie use' ta mean you was from Oklahoma. Now it means you're a dirty son-of-a-bitch." [John Steinbeck, "The Grapes of Wrath," 1939]
A native or resident of Okinawa (WWII armed forces)