'Butterball' definitions:

Definition of 'butterball'

(from WordNet)
noun
A rotund individual [syn: fatso, fatty, fat person, roly-poly, butterball] [ant: scrag, skin and bones, thin person]
noun
Small North American diving duck; males have bushy head plumage [syn: bufflehead, butterball, dipper, Bucephela albeola]

Definition of 'Butterball'

From: GCIDE
  • Butterball \But"ter*ball`\, n. (Zool.)
  • 1. The buffel duck. [1913 Webster]
  • 2. a fat person or animal. [informal] [PJC]
  • 3. a lump of butter rounded into a ball. [PJC]
  • 4. [Trademark] a plump chicken or turkey prepared for cooking. [PJC]