The Collaborative International Dictionary of English v.0.48:

Smug \Smug\, v. t. [imp. & p. p. Smugged; p. pr. & vb. n.
   Smugging.]
   To make smug, or spruce. [Obs.]
   [1913 Webster]

         Thus said, he smugged his beard, and stroked up fair.
                                                  --Dryton.
   [1913 Webster]