Source : Webster's Revised Unabridged Dictionary (1913)

Swinger \Swing"er\, n.
   One who swings or whirls.

Swinger \Swin"ger\, n.
   1. One who swinges.

   2. Anything very large, forcible, or astonishing. [Obs. or
      Colloq.] --Herrick.

Source : WordNet®

swinger
     n 1: someone who swings sports implements
     2: a person who engages freely in promiscuous sex [syn: {tramp}]