faff about vs slummock

faff about

verb

  • To waste time; spend time idly. 

slummock

verb

  • To behave lazily or indolently 

  • To behave awkwardly or clumsily 

noun

  • A slovenly person 

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