The Collaborative International Dictionary of English v.0.48:

Free-liver \Free"-liv`er\, n.
   One who gratifies his physical appetites without stint; one
   given to indulgence in eating and drinking.
   [1913 Webster]

WordNet (r) 3.0 (2006):

free-liver
    n 1: someone who gratifies physical appetites (especially for
         food and drink) with more than the usual freedom