The Collaborative International Dictionary of English v.0.48:

Pouch \Pouch\, n. [F. poche a pocket, pouch, bag; probably of
   Teutonic origin. See Poke a bag, and cf. Poach to cook
   eggs, to plunder.]
   1. A small bag; usually, a leathern bag; as, a pouch for
      money; a shot pouch; a mail pouch, etc.
      [1913 Webster]

   2. That which is shaped like, or used as, a pouch; as:
      (a) A protuberant belly; a paunch; -- so called in
          ridicule.
      (b) (Zool.) A sac or bag for carrying food or young; as,
          the cheek pouches of certain rodents, and the pouch of
          marsupials.
      (c) (Med.) A cyst or sac containing fluid. --S. Sharp.
      (d) (Bot.) A silicle, or short pod, as of the shepherd's
          purse.
      (e) A bulkhead in the hold of a vessel, to prevent grain,
          etc., from shifting.
          [1913 Webster]

   Pouch mouth, a mouth with blubbered or swollen lips.
      [1913 Webster]