goof off vs slummock

goof off

verb
  • To dawdle, lollygag; to waste time aimlessly or engage in idle activity or inactivity. 

slummock

verb
  • To behave lazily or indolently 

  • To behave awkwardly or clumsily 

noun
  • A slovenly person 

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