'fatso' definitions:

Definition of 'fatso'

From: WordNet
noun
A rotund individual [syn: fatso, fatty, fat person, roly-poly, butterball] [ant: scrag, skin and bones, thin person]

Definition of 'fatso'

From: GCIDE
  • fatso \fatso\ n. a rotund, obese individual.
  • Syn: fatty, fat person, roly-poly. [WordNet 1.5]