shart vs soil oneself

shart

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

noun
  • An instance of sharting. 

  • The resulting excrement from sharting. 

soil oneself

verb
  • To lose control of one's bowels and accidentally defecate on oneself. 

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