shitter vs small room

shitter

noun
  • A toilet or lavatory; an outhouse. 

  • One who defecates. 

  • The anus. 

  • Someone lacking skill, especially in a video game. 

  • An objectionable person or thing. 

small room

noun
  • A lavatory: a room intended for urination and defecation. 

  • Used other than figuratively or idiomatically: see small, room. 

How often have the words shitter and small room occurred in a corpus of books? (source: Google Ngram Viewer )