Green’s Dictionary of Slang

(US) a native of Indiana.

c.1833		‘The Hoosheroons’ in Atkinson’s Casket May 216/1: Where half a dozen Hoosheroons, / With mush and milk, tincups and spoons / White heads, bare feet and dirty faces / Seemed much inclined to keep their places .
1853		Daily Morning Herald (St Louis) 27 Apr. n.p.: He looks like a Hoosieroon; all he lacks is a chunk of gingerbread in his fist [DA].