front hole vs trouser

front hole

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

  • A vagina, especially of a trans man. 

trouser

noun
  • Of or relating to trousers. 

  • A pair of trousers. 

verb
  • To secretively steal (an item or money) for personal use. 

  • To put (money) into one's trouser pocket; to pocket. 

  • To take and keep (something, especially money, that is not one's own); to pocket. 

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