The Collaborative International Dictionary of English v.0.48:

Barbecue \Bar"be*cue\, v. t. [imp. & p. p. Barbecued; p. pr. &
   vb. n. Barbecuing.]
   1. To dry or cure by exposure on a frame or gridiron.
      [1913 Webster]

            They use little or no salt, but barbecue their game
            and fish in the smoke.                --Stedman.
      [1913 Webster]

   2. To roast or broil whole, as an ox or hog.
      [1913 Webster]

            Send me, gods, a whole hog barbecued. --Pope.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

barbecuing \barbecuing\ n.
   Roasting a large piece of meat on a grill or a revolving spit
   out of doors over an open fire.
   [WordNet 1.5]

WordNet (r) 3.0 (2006):

barbecuing
    n 1: roasting a large piece of meat on a revolving spit out of
         doors over an open fire