gash vs tunnel of love

gash

noun
  • A vulva. 

  • A deep cut. 

  • Rubbish on board an aircraft. 

  • Unused film or sound during film editing. 

  • Rubbish, spare kit. 

  • A woman. 

  • Poor quality beer, usually watered down. 

adj
  • ghastly; hideous 

  • Of poor quality; makeshift; improvised; temporary; substituted. 

verb
  • To make a deep, long cut; to slash. 

tunnel of love

noun
  • The vagina. 

  • A carnival dark ride for couples in boats, either relaxing and romantic, or spooky (encouraging the couple to cling to one another). 

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