butterball vs fat-ass

butterball

noun
  • An overweight person. 

  • A round lump of a coagulated fat used in cooking such as butter, margarine, or a spread 

  • A small North American duck, the bufflehead, Bucephala albeola 

  • A turkey. 

fat-ass

noun
  • A rotund, overweight, or obese person. 

  • A jibe used on someone disliked, frequently someone regarded as lazy. 

How often have the words butterball and fat-ass occurred in a corpus of books? (source: Google Ngram Viewer )