boff vs oestrus

boff

noun
  • A hit or smack. 

  • A great success; a hit. 

  • A pupil who works hard; a swot. 

  • A line in a film etc that elicits such a laugh. 

  • A big laugh. 

verb
  • to have sexual intercourse (with someone) 

  • To hit; to strike. 

oestrus

noun
  • A bite or sting. 

  • A biting fly of the genus Oestrus; a botfly. 

  • A female animal's readiness to mate; heat, rut. 

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