girl vs vertical smile

girl

noun
  • One's girlfriend. 

  • A queen (the playing card). 

  • One's daughter. 

  • A boy or man who is weak or sentimental. 

  • A female servant; a maid. (see usage notes) 

  • A female (tree, gene, etc). 

  • Cocaine, especially in powder form. 

  • A term of endearment. (see usage notes) 

  • A woman, especially a young and often attractive woman. 

  • A female child, adolescent, or a young woman. 

  • A young female animal. 

verb
  • To feminize or girlify; to gender as a girl or as for girls. 

  • To staff with or as a girl or girls. 

vertical smile

noun
  • A vulva. 

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