pinch one off vs shart

pinch one off

verb

  • To defecate. 

shart

verb

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

noun

  • An instance of sharting. 

  • The resulting excrement from sharting. 

How often have the words pinch one off and shart occurred in a corpus of books? (source: Google Ngram Viewer )