brass ovaries vs spunk

brass ovaries

noun

  • courage, guts 

spunk

noun

  • Courage; spirit; mettle; determination. 

  • An attractive person (normally male). 

  • Touchwood; tinder. 

  • Semen. 

verb

  • To ejaculate. 

  • To waste (money etc.). 

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