Green’s Dictionary of Slang

(US) Native American.

1843		‘Madison Tensas’ Louisiana ‘Swamp Doctor’ (1850) 171: There is not a child, white, black, Injun, or nigger, from the Arkansas line to Trinity, but what has heard of me.
1848		‘Ned Buntline’ Mysteries and Miseries of N.Y. III 27: Ask for Julia, de ole Ingun woman!
c.1850		F.M. Whitcher Widow Bedott Papers (1883) 25: We’re all great hands for injin bread here.
1853		S. Northup Twelve Years A Slave 219: Den we’ll go to the Ingin nation, / All I want in dis creation, / Is pretty little wife and big plantation.
1869		H.B. Stowe Oldtown Folks 191: 526: She’s got a new Injy shawl.
1895		Indian Chieftain (Vinita, Indian Territ., OK) 12 Dec. 1/3: Injun Oratory. The Speech of Old Tecumseh to general Stockbridge.
1904		G.D. Chase ‘Cape Cod Dialect’ in DN II:vi 426: injiny, adj. Like an Indian. ‘She’s dreadful injiny looking somehow.’.
1983		A-Team Storybook 58: Those engines makes a din worse than injun drums.
1991		F. Mac Anna Last of the High Kings 137: Not for nothing had sheriff Bart Wyatt learned to fight dirty during the Injun Wars of ’76.