Source : Webster's Revised Unabridged Dictionary (1913)

Doxy \Dox"y\, n.; pl. {Doxies}. [See {Duck} a pet.]
   A loose wench; a disreputable sweetheart. --Shak.

Source : WordNet®

doxy
     n : a woman who cohabits with an important man [syn: {concubine},
          {courtesan}, {odalisque}, {paramour}]