my foot vs psht

my foot

intj
  • Used other than figuratively or idiomatically: see my, foot. 

  • Indicates disapproval, disregard, disdain, disgust or disbelief. 

psht

intj
  • Synonym of pshaw 

  • Synonym of scat 

  • Synonym of shh 

How often have the words my foot and psht occurred in a corpus of books? (source: Google Ngram Viewer )