cocksack vs treasure chest

cocksack

noun
  • Clothing that covers the scrotum in a manner similar to a codpiece. 

  • The scrotum. 

  • A term of abuse. 

treasure chest

noun
  • A chest filled with treasure, especially one used by pirates, etc. 

  • Any source of something valuable or beautiful. 

  • A treasury, especially a state or royal treasury. 

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