johnny vs litter box

johnny

noun
  • A condom. 

  • An inexperienced new worker, usually an immigrant. 

  • A hospital gown: a gown with a back opening closed with snaps or ties, worn by hospital patients. 

litter box

noun
  • A box used to provide a soiling area for (usually) pet cats, generally filled with kitty litter, sand, clay chips, etc. 

How often have the words johnny and litter box occurred in a corpus of books? (source: Google Ngram Viewer )