fess vs spill one's guts

fess

verb
  • To confess; to admit. 

noun
  • A horizontal band across the middle of the shield. 

adj
  • Of animals, bad-tempered, fierce. 

  • Lively; active; strong. 

  • Proud; conceited. 

spill one's guts

verb
  • To confess, or to divulge secrets, typically speaking freely and at length after a change of motive or an incentive. 

  • To vomit. 

How often have the words fess and spill one's guts occurred in a corpus of books? (source: Google Ngram Viewer )