BFE vs bumfuck

BFE

bumfuck

adj
  • I hate living in this small town in the middle of bumfuck nowhere. 

  • Isolated and neglected, undesirable, or held in contempt. 

verb
  • To fuck anally. 

noun
  • Anal sex. 

  • An isolated place far removed from major cities. 

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