The Collaborative International Dictionary of English v.0.48:

honky \honky\ n.
   1. A white (caucasian) person; -- a term used by some
      African-Americans, intended to be disparaging and often
      taken as offensive. [Also spelled honkie and honkey.]

   Syn: whitey.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

honky
    n 1: (slang) offensive names for a White man [syn: whitey,
         honky, honkey, honkie]

Moby Thesaurus II by Grady Ward, 1.0:

41 Moby Thesaurus words for "honky":
   American Indian, Amerind, Australian aborigine, Bushman, Caucasian,
   Indian, Malayan, Mister Charley, Mongolian, Negrillo, Negrito,
   Negro, Oriental, Red Indian, WASP, black, black man, blackfellow,
   boy, brown man, burrhead, colored person, coon, darky, gook,
   jigaboo, jungle bunny, nigger, niggra, ofay, paleface, pygmy,
   red man, redskin, slant-eye, spade, the Man, white, white man,
   whitey, yellow man