piff vs twat

piff

noun
  • Piffle; nonsense; rubbish. 

intj
  • An exclamation of annoyance or contempt; pish; pshaw. 

verb
  • To throw something vigorously. 

adj
  • good or attractive. 

twat

noun
  • A contemptible and stupid person, idiot. 

  • The vagina or vulva. 

verb
  • To hit, slap. 

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