The Collaborative International Dictionary of English v.0.48:

Kisser \Kiss"er\, n.
   1. One who kisses.                             --Beau. & Fl.
      [1913 Webster]

   2. the face or mouth. [slang]
      [PJC]

WordNet (r) 3.0 (2006):

kisser
    n 1: someone who kisses [syn: kisser, osculator]
    2: the human face (`kisser' and `smiler' and `mug' are informal
       terms for `face' and `phiz' is British) [syn: countenance,
       physiognomy, phiz, visage, kisser, smiler, mug]

Moby Thesaurus II by Grady Ward, 1.0:

34 Moby Thesaurus words for "kisser":
   bazoo, chaps, chops, countenance, dial, embouchure, face, facies,
   favor, features, gab, gob, jaw, jaws, jowls, lineaments, lips,
   mandibles, map, maw, maxilla, mouth, mug, mush, muzzle,
   oral cavity, pan, phiz, physiognomy, premaxilla, puss, trap,
   visage, yap