shart vs shit fire and save matches

shart

noun
  • An instance of sharting. 

  • The resulting excrement from sharting. 

verb
  • To unintentionally defecate due to relaxing the anus to flatulate. 

shit fire and save matches

intj
  • An exclamation of surprise. 

How often have the words shart and shit fire and save matches occurred in a corpus of books? (source: Google Ngram Viewer )