arnchy, n. — Green’s Dictionary of Slang

arnchy n.

[? corruption of SE aren’t you, e.g. ‘aren’t you the one’, ‘aren’t you the big shot’ etc]

(US black) one who puts on airs.

1924		W.C. Handy ‘Basement Blues’ 🎵 He ain’t no arnchy.
1926		Van Vechten Nigger Heaven 192: He caught phrases: posin’ an’ signifyin’, high-toned mustard-seed, arnchy yaller boy. [Ibid.] 194: One of ’em called me arnchy.
1931		N. Van Patten ‘Vocab. of the Amer. Negro’ in AS VII:1 26: arnchy. V.n. A person who puts on airs.