fat-ass vs heffalump

fat-ass

noun
  • A rotund, overweight, or obese person. 

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

heffalump

noun
  • A clumsy or overweight person. 

  • (A child's name for) an elephant. 

  • Something that is elusive. 

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