etc. vs yada yada yada

etc.

phrase
  • And so on: used to note that the rest of a list or piece of information has been left out on the assumption that it is similar or already known. 

yada yada yada

phrase
  • And so on; and so forth. 

  • blah blah blah. 

How often have the words etc. and yada yada yada occurred in a corpus of books? (source: Google Ngram Viewer )