doot vs spitball

doot

verb
  • think 

  • to scan 

  • to tap a card 

  • doubt 

noun
  • doubt 

  • beep (electronically-produced tone) 

spitball

verb
  • To brainstorm ideas. 

  • To moisten the ball with saliva before pitching it. 

noun
  • A balled-up piece of paper, moistened with saliva (by chewing) and shot through a drinking straw. 

  • A pitch of a baseball that has been partly covered with saliva, illegal at most levels. 

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