The Collaborative International Dictionary of English v.0.48:

Masher \Mash"er\, n.
   1. One who, or that which, mashes; also (Brewing), a machine
      for making mash.
      [1913 Webster]

   2. A charmer of women. [Slang] --London Punch.
      [1913 Webster] Mashie

WordNet (r) 3.0 (2006):

masher
    n 1: a man who is aggressive in making amorous advances to women
         [syn: wolf, woman chaser, skirt chaser, masher]
    2: a kitchen utensil used for mashing (e.g. potatoes)

Moby Thesaurus II by Grady Ward, 1.0:

66 Moby Thesaurus words for "masher":
   Beau Brummel, Casanova, Don Juan, beau, beetle, blade, blood,
   boulevardier, chaser, cheese grater, clotheshorse, comminutor,
   coxcomb, crusher, dandy, digester, dude, exquisite, fashion plate,
   fine gentleman, fop, fribble, gallant, granulator, grater, grinder,
   heartbreaker, jack-a-dandy, jackanapes, kominuter, lady-killer,
   lecher, levigator, libertine, macaroni, macerator, man-about-town,
   mill, millstone, mortar and pestle, nutmeg grater, pestle,
   philander, philanderer, potato masher, pulp machine, pulper,
   pulpifier, pulverizer, puppy, quern, quernstone, rock crusher,
   roller, seducer, shredder, skirt chaser, smasher, spark, sport,
   steamroller, swell, triturator, wolf, woman chaser, womanizer