The Collaborative International Dictionary of English v.0.48:

Overgorge \O`ver*gorge"\, v. t.
   To gorge to excess.
   [1913 Webster]

WordNet (r) 3.0 (2006):

overgorge
    v 1: overeat or eat immodestly; make a pig of oneself; "She
         stuffed herself at the dinner"; "The kids binged on ice
         cream" [syn: gorge, ingurgitate, overindulge, glut,
         englut, stuff, engorge, overgorge, overeat,
         gormandize, gormandise, gourmandize, binge, pig
         out, satiate, scarf out]