my foot vs really

my foot

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

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

really

intj
  • Indicating displeasure at another person's behaviour or statement. 

  • Indicating that what was just said was obvious and unnecessary; contrived incredulity 

  • Indicating affirmation, agreement. 

  • Indicating surprise at, or requesting confirmation of, some new information; to express skepticism. 

adv
  • Actually; in fact; in reality. 

  • Very (modifying an adjective); very much (modifying a verb). 

  • In a way or manner that is real, not unreal. 

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