attaboy vs attagirl

attaboy

intj
  • Used to show encouragement or approval to a boy, man, or male animal. 

noun
  • A cry of "attaboy"; an accolade. 

attagirl

intj
  • Used to show encouragement or approval to a girl, woman or female animal. 

noun
  • A cry of "attagirl"; an accolade. 

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