Source : Webster's Revised Unabridged Dictionary (1913)

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.

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

   2. To roast or broil whole, as an ox or hog.

            Send me, gods, a whole hog barbecued. --Pope.

Source : WordNet®

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