Green’s Dictionary of Slang

pertaining to Oklahoma or emigrants from that state.

1947		N. Algren ‘Depend on Aunt Elly’ in Texas Stories (1995) 102: She looked up the Okie cop with another piece of paper in her hand.
1957		Kerouac On The Road (1972) 93: I borrowed a bicycle from one of the Okie boys.
1964		H.S. Thompson letter 21 Feb. in Proud Highway (1997) 439: I now live in a sort of Okie shack.
1973		E. Bunker No Beast So Fierce 154: George Rimmer might have been a loner, or run with an Okie clique.
1988		T. Harris Silence of the Lambs (1991) 21: Is it the West Virginia Starlings or the Okie Starlings, Officer?