ball sack vs wacko

ball sack

noun

  • An objectionable person (especially a man). 

  • The scrotum. 

wacko

noun

  • An amusingly eccentric or irrational person. 

adj

  • Amusingly eccentric or irrational. 

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