Source : Webster's Revised Unabridged Dictionary (1913)

Gammon \Gam"mon\ (-m[u^]n), n. [OF. gambon, F. jambon, fr. OF.
   gambe leg, F. jambe. See {Gambol}, n., and cf. {Ham}.]
   The buttock or thigh of a hog, salted and smoked or dried;
   the lower end of a flitch. --Goldsmith.

Gammon \Gam"mon\, v. t.
   1. To beat in the game of backgammon, before an antagonist
      has been able to get his ``men'' or counters home and
      withdraw any of them from the board; as, to gammon a
      person.

   2. To impose on; to hoax; to cajole. [Colloq.] --Hood.

Gammon \Gam"mon\, v. t. [imp. & p. p. {Gammoned} (-m[u^]nd); p.
   pr. & vb. n. {Gammoning}.]
   To make bacon of; to salt and dry in smoke. [1913 Webster]

Gammon \Gam"mon\, n. [See 2d {Game}.]
   1. Backgammon.

   2. An imposition or hoax; humbug. [Colloq.]

Gammon \Gam"mon\, v. t. [Etymol. unknown.] (Naut.)
   To fasten (a bowsprit) to the stem of a vessel by lashings of
   rope or chain, or by a band of iron. --Totten.

Source : WordNet®

gammon
     n 1: meat cut from the thigh of a hog (usually smoked) [syn: {ham},
           {jambon}]
     2: hind portion of a side of bacon