shart vs you don't say

shart

noun
  • An instance of sharting. 

  • The resulting excrement from sharting. 

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

you don't say

intj
  • Really?; no kidding!; is that so? (sometimes used sarcastically in response to the obvious) 

How often have the words shart and you don't say occurred in a corpus of books? (source: Google Ngram Viewer )