shart vs spend a penny

shart

verb

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

noun

  • An instance of sharting. 

  • The resulting excrement from sharting. 

spend a penny

verb

  • To use the toilet. 

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