slummock vs twiddle one's thumbs

slummock

verb
  • To behave lazily or indolently 

  • To behave awkwardly or clumsily 

noun
  • A slovenly person 

twiddle one's thumbs

verb
  • To wait or dawdle; to accomplish nothing useful or lack a useful occupation. 

  • to circle one's thumbs around one another, usually with the fingers interlaced, usually done idly while waiting or bored 

How often have the words slummock and twiddle one's thumbs occurred in a corpus of books? (source: Google Ngram Viewer )