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.
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            A man who swaggers about London clubs.
                                                  --Beaconsfield.
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   2. To boast or brag noisily; to be ostentatiously proud or
      vainglorious; to bluster; to bully.
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            What a pleasant it is . . . to swagger at the bar!
                                                  --Arbuthnot.
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            To be great is not . . . to swagger at our footmen.
                                                  --Colier.
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