goodbye vs yo

goodbye

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

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

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

yo

intj
  • Emphatic conclusion to a statement. 

  • An expression of surprise or excitement. 

  • An interjection similar to hey. 

  • A greeting similar to hi. 

  • Present! Here! 

noun
  • The letter Ё, ё. 

pron
  • third-person singular, familiar 

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