The Collaborative International Dictionary of English v.0.48:

Swagger \Swag"ger\, v. i. [imp. & p. p. Swaggered; p. pr. &
   vb. n. Swaggering.] [Freq. of swag.]
   1. To walk with a swaying motion; hence, to walk and act in a
      pompous, consequential manner.
      [1913 Webster]

            A man who swaggers about London clubs.
                                                  --Beaconsfield.
      [1913 Webster]

   2. To boast or brag noisily; to be ostentatiously proud or
      vainglorious; to bluster; to bully.
      [1913 Webster]

            What a pleasant it is . . . to swagger at the bar!
                                                  --Arbuthnot.
      [1913 Webster]

            To be great is not . . . to swagger at our footmen.
                                                  --Colier.
      [1913 Webster]

WordNet (r) 3.0 (2006):

swaggering
    adj 1: having or showing arrogant superiority to and disdain of
           those one views as unworthy; "some economists are
           disdainful of their colleagues in other social
           disciplines"; "haughty aristocrats"; "his lordly manners
           were offensive"; "walked with a prideful swagger"; "very
           sniffy about breaches of etiquette"; "his mother eyed my
           clothes with a supercilious air"; "a more swaggering mood
           than usual"- W.L.Shirer [syn: disdainful, haughty,
           imperious, lordly, overbearing, prideful,
           sniffy, supercilious, swaggering]
    2: flamboyantly adventurous [syn: swaggering, swashbuckling]

Moby Thesaurus II by Grady Ward, 1.0:

33 Moby Thesaurus words for "swaggering":
   aweless, barefaced, blustering, blusterous, blustery, boisterous,
   bold, bold as brass, boldfaced, brassy, brazen, brazenfaced,
   bullying, hectoring, lost to shame, noisy, peacockish, peacocky,
   raging, ranting, raving, roistering, roisterous, rollicking,
   shameless, storming, strutting, swashbucklering, swashbuckling,
   swashing, tumultuous, unabashed, unblushing