monkey-ass adjective2 •(slang, offensive) Used against black people as an abusive qualifier or insult intensifier.As he reentered the IMF area, Anderson called him a monkey-ass nigger boy. — 1975 •(slang, offensive) Used as an intensifier (regardless of referent).Excuse me? I think most poeple now realize that YOU and your other monkey-ass moron friends that defend Sprint are the real idiots. — 1999