Green’s Dictionary of Slang

(US) unsophisticated, gauche, rustic, characteristic of a country person.

1935		S. Kingsley Dead End Act I: Oh, she counts huh money all a time, huh, Jakey Ikey?
1953		Randolph & Wilson Down in the Holler 256: jakey: adj. Countrified, old-fashioned, uncouth.
1964		Stephenson ‘Miscellany’ in AS XXXIX:3 235: jakey, adj. Peculiar or odd in appearance.
1989		Eble Campus Sl. Sept. 4: jakey – dull-witted, simple, out of style: What a jakey shirt.