Whateverville vs back forty

Whateverville

name
  • A substitute placename for an inhabited place, a city or town, with an unknown or unspecified name. 

back forty

noun
  • The most remote or inaccessible part of any place. 

  • The remote part of a farm. 

How often have the words Whateverville and back forty occurred in a corpus of books? (source: Google Ngram Viewer )