my ass vs tush

my ass

intj
  • Indicates disapproval, disagreement, or disbelief, often with a tone of disregard, disdain, or disgust, referring to the buttocks. 

pron
  • I; me; myself; oneself in the third person. 

tush

intj
  • An exclamation of contempt or rebuke. 

noun
  • The buttocks. 

  • A tusk. 

  • Nonsense; tosh. 

  • A small tusk sometimes found on the female Indian elephant. 

verb
  • To express contempt; rebuke. 

  • To pull or drag a heavy object such as a tree or log. 

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