goodbye vs what's new

goodbye

verb
  • To say goodbye; to wish somebody farewell on parting. 

noun
  • An utterance of goodbye, the wishing of farewell to someone. 

intj
  • Farewell; a formula used to another person or persons when the speaker, writer, or person addressed is departing. 

what's new

noun
  • The latest developments in a particular situation or a person's life. 

phrase
  • An informal greeting asking the other person what has recently happened in their life. A typical response might be "Not much; you?". The greeting is not always literal and may just be used to say hello. 

  • A rhetorical request for some real news, on hearing a report that was not news because it represents a continuing predictable and unsatisfactory situation. 

How often have the words goodbye and what's new occurred in a corpus of books? (source: Google Ngram Viewer )