Source : Webster's Revised Unabridged Dictionary (1913)

Prime \Prime\, v. t. [imp. & p. p. {Primed}; p. pr. & vb. n.
   {Priming}.] [From {Prime}, a.]
   1. To apply priming to, as a musket or a cannon; to apply a
      primer to, as a metallic cartridge.

   2. To lay the first color, coating, or preparation upon (a
      surface), as in painting; as, to prime a canvas, a wall.

   3. To prepare; to make ready; to instruct beforehand; to
      post; to coach; as, to prime a witness; the boys are
      primed for mischief. [Colloq.] --Thackeray.

   4. To trim or prune, as trees. [Obs. or Prov. Eng.]

   5. (Math.) To mark with a prime mark.

   {To prime a pump}, to charge a pump with water, in order to
      put it in working condition.

Source : WordNet®

primed
     adj : (usually followed by `to' or `for') on the point of or
           strongly disposed; "in no fit state to continue"; "fit
           to drop"; "laughing fit to burst"; "she was fit to
           scream"; "primed for a fight"; "we are set to go at any
           time" [syn: {fit(p)}, {primed(p)}, {set(p)}]