Green’s Dictionary of Slang

1. (also country ike) an ignorant rustic male.

1896		DN I 419: Ike...an uncouth fellow. ‘He’s an awful Ike.’.
1914		Ade ‘The New Fable of The Toilsome Ascent’ in Ade’s Fables 178: He ignored the Whispering Ikes who met in the dim Back Room, with Cotton plugged in the Key Hole.
1915		M.G. Hayden ‘Terms Of Disparagement’ in DN IV:iii 199: Ike, crazy Ike, an uncouth fellow. ‘The crazy Ike didn’t know enough to tip his cap when I introduced him to mother.’.
1920		Ade Hand-made Fables 69: [They] still have the Idea firmly set in their Cokes that running a Whizzer or whooping before the Draw is a legitimate Pastime and Nobody’s Business, except the Ike that gets hooked.
1929		(con. 1917–18) C. MacArthur War Bugs 234: The green Ikes scattered all over [...] trying to cover their inexperience by talking loud.
1957		H.B. Allen ‘Pejorative Terms for Midwest Farmers’ in AS XXXIII:4 265: [...] country ike.

2. a self-important, pretentious person.

1906

Comic Section N.-Y. American and Journal 13 May 1: I wish I were on top of that dear ike’s peak.

3. a derog. term for a Jew.

1884		Ally Sloper’s Half Holiday 14 June 50/3: If A. Sloper runs into debt, he only does so after a struggle. With Ike it’s different.
1900		Sporting Times 3 Mar. 1/4: Mr. Ike Jacobs owes fifty, does he?
1909		I.L. Nascher Wretches of Povertyville 11: Here Ike and Mike mix jargon and brogue over the bar of a German saloon.
1915		R. Lardner ‘Alibi Ike’ in Coll. Short Stories (1941) 35: What do you all call me Ike for? I ain’t no Yid.
1927		(con. 1914–18) L. Nason Three Lights from a Match 254: Only ‘Glasseyed Ike’ there, he washes his.
1930		(con. 1921) G. Milburn ‘The Hobo Convention at Portland’ in Hobo’s Hornbook 29: ‘Con the Sneak’ from Battle Creek, / And ‘Mississippi Ike’.
1939		J. Campbell Babe is Wise 231: These Ikes’re no different t’anyone else once they make a bit o’ dough. [...] Believe me you wouldn’t see Moma an’ Poppa an’ all the little Yids for dust . . .
1962		A. La Guma A Walk in the Night (1968) 13: A balding Jew called Mister Ike served behind the bar.
1978		Maledicta II:1+2 (Summer/Winter) 161: Ike Familiar, derisive name for any Jewish male.
1989		H. Rawson Dict. of Invective (1991) 279: Other generics include: [...] Ike or Ikey, also a Jew.