shithouse vs yellow back

shithouse

noun
  • A coward: one who is overly fearful or timid. 

  • An outhouse, an outbuilding used as a lavatory 

  • A filthy place. 

verb
  • To engage in persistent unsporting behaviour or gamesmanship; to play in a cynical, ugly manner; to cheat without being punished. 

adj
  • Of poor quality. 

yellow back

noun
  • A coward. 

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