Source : Webster's Revised Unabridged Dictionary (1913)

Bung \Bung\, v. t. [imp. & p. p. {Bunged}; p. pr. & vb. n.
   {Bunging}.]
   To stop, as the orifice in the bilge of a cask, with a bung;
   to close; -- with up.

   {To bung up}, to use up, as by bruising or over exertion; to
      exhaust or incapacitate for action. [Low]

            He had bunged up his mouth that he should not have
            spoken these three years.             --Shelton
                                                  (Trans. Don
                                                  Quixote).

Bung \Bung\, n. [Cf. W. bwng orfice, bunghole, Ir. buinne tap,
   spout, OGael. buine.]
   1. The large stopper of the orifice in the bilge of a cask.

   2. The orifice in the bilge of a cask through which it is
      filled; bunghole.

   3. A sharper or pickpocket. [Obs. & Low]

            You filthy bung, away.                --Shak.

Source : WordNet®

bung
     n : a plug used to close a hole in a barrel or flask [syn: {spile}]
     v 1: give a tip or gratuity to in return for a service, beyond
          the agreed-on compensation; "Remember to tip the
          waiter"; "fee the steward" [syn: {tip}, {fee}]
     2: close with a cork or stopper