a migratory agricultural worker, esp. one who migrated west from Oklahoma or other areas of the Great Plains because of drought, farm foreclosure, etc., in the late 1930s: often a disparaging term
See Okie in American Heritage Dictionary 4
(ōˈkē)
noun
Offensive Slang A migrant farm worker from the south-central United States, especially one seeking work in the West or Southwest during the 1930s and 1940s.