ball sack vs nutsack

ball sack

noun

  • An objectionable person (especially a man). 

  • The scrotum. 

nutsack

noun

  • An objectionable person (especially a man). 

  • A bag in which nuts are carried or stored. 

  • The scrotum. 

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