The Collaborative International Dictionary of English v.0.48:

Vapor \Va"por\, v. i. [imp. & p. p. Vapored; p. pr. & vb. n.
   Vaporing.] [From Vapor, n.: cf. L. vaporare.] [Written
   also vapour.]
   [1913 Webster]
   1. To pass off in fumes, or as a moist, floating substance,
      whether visible or invisible, to steam; to be exhaled; to
      evaporate.
      [1913 Webster]

   2. To emit vapor or fumes. [R.]
      [1913 Webster]

            Running waters vapor not so much as standing waters.
                                                  --Bacon.
      [1913 Webster]

   3. To talk idly; to boast or vaunt; to brag.
      [1913 Webster]

            Poets used to vapor much after this manner.
                                                  --Milton.
      [1913 Webster]

            We vapor and say, By this time Matthews has beaten
            them.                                 --Walpole.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Vaporing \Va"por*ing\, a.
   Talking idly; boasting; vaunting. -- Va"por*ing*ly, adv.
   [1913 Webster]

WordNet (r) 3.0 (2006):

vaporing
    n 1: an instance of boastful talk; "his brag is worse than his
         fight"; "whenever he won we were exposed to his gasconade"
         [syn: brag, bragging, crow, crowing, vaporing,
         line-shooting, gasconade]