front bum vs life force

front bum

noun
  • The vagina or vulva. 

  • A bipartite mass of abdominal fat. 

life force

noun
  • An impulse or influence that gives something life or vitality. 

  • The hypothetical principle that animates all living organisms. 

How often have the words front bum and life force occurred in a corpus of books? (source: Google Ngram Viewer )