big white telephone vs khazi

big white telephone

noun
  • A toilet, as a receptacle for vomiting. 

khazi

noun
  • A toilet: a fixture used for urination and defecation (also figurative). 

  • An outhouse or lavatory: a place used for urination and defecation. 

How often have the words big white telephone and khazi occurred in a corpus of books? (source: Google Ngram Viewer )