front bum vs front hole

front bum

noun
  • The vagina or vulva. 

  • A bipartite mass of abdominal fat. 

front hole

noun
  • A vagina, especially of a trans man. 

  • Used other than figuratively or idiomatically: see front, hole. 

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