back alley vs craphole

back alley

noun
  • The anus. 

  • An alleyway that runs behind a row of houses, or between rows of houses 

craphole

noun
  • anus 

  • a contemptible person 

  • a messy or unkempt place 

How often have the words back alley and craphole occurred in a corpus of books? (source: Google Ngram Viewer )