Source : Webster's Revised Unabridged Dictionary (1913)

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.

            A man who swaggers about London clubs.
                                                  --Beaconsfield.

   2. To boast or brag noisily; to be ostentatiously proud or
      vainglorious; to bluster; to bully.

            What a pleasant it is . . . to swagger at the bar!
                                                  --Arbuthnot.

            To be great is not . . . to swagger at our footmen.
                                                  --Colier.

Source : WordNet®

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";
            "shaggy supercilious camels"; "a more swaggering mood
            than usual"- W.L.Shirer [syn: {disdainful}, {haughty},
             {lordly}, {prideful}, {sniffy}, {supercilious}]
     2: flamboyantly adventurous [syn: {swashbuckling}]