Source : Webster's Revised Unabridged Dictionary (1913)

Smug \Smug\, v. t. [imp. & p. p. {Smugged}; p. pr. & vb. n.
   {Smugging}.]
   To make smug, or spruce. [Obs.]

         Thus said, he smugged his beard, and stroked up fair.
                                                  --Dryton.