galah vs squarehead

galah

noun
  • A fool, an idiot. 

  • A pink and grey species of cockatoo, Eolophus roseicapilla, native to Australia. 

squarehead

noun
  • A socially conventional or boring person. 

  • A foreigner of Germanic origin, especially a German, Dutch, or Scandinavian person. 

  • An honest person; a non-criminal. 

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