ball sack vs varmint

ball sack

noun
  • An objectionable person (especially a man). 

  • The scrotum. 

varmint

noun
  • An obnoxious person or troublemaker. 

  • A pestering animal such as one that kills or harasses a farmer's livestock or crops. 

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