Green’s Dictionary of Slang

1. a sexually attractive woman.

1928

C. McKay Home to Harlem 285: All these cut-thwoat niggers in Harlem ready to carve up one another foh a li’l’ insisnificant [sic] humpy.

2. (US gay) a good-looking man.

1978

L. Kramer Faggots 61: Eyes belonging to humpies much humpier than he.