The Collaborative International Dictionary of English v.0.48:

Braggadocio \Brag`ga*do"cio\, n. [From Braggadocchio, a boastful
   character in Spenser's "Fa["e]rie Queene."]
   1. A braggart; a boaster; a swaggerer. --Dryden.
      [1913 Webster]

   2. Empty boasting; mere brag; pretension.
      [1913 Webster]

WordNet (r) 3.0 (2006):

braggadocio
    n 1: vain and empty boasting [syn: braggadocio, bluster,
         rodomontade, rhodomontade]