who cares vs whoopee do

who cares

phrase
  • A reply that diminishes the importance of another speaker's immediately preceding statement. 

  • A reply to an unimportant or irrelevant statement, indicating indifference on the part of the speaker. 

whoopee do

noun
  • Event marked by excitement 

  • Commotion 

How often have the words who cares and whoopee do occurred in a corpus of books? (source: Google Ngram Viewer )