The Collaborative International Dictionary of English v.0.48:

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.
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   2. To lay the first color, coating, or preparation upon (a
      surface), as in painting; as, to prime a canvas, a wall.
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   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.
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   4. To trim or prune, as trees. [Obs. or Prov. Eng.]
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   5. (Math.) To mark with a prime mark.
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   To prime a pump, to charge a pump with water, in order to
      put it in working condition.
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WordNet (r) 3.0 (2006):

primed
    adj 1: (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)]