piss about vs trifle

piss about

verb
  • to misbehave; to act foolishly 

  • to joke or play 

trifle

verb
  • To squander or waste. 

  • To deal with something as if it were of little importance or worth. 

  • To act, speak, or otherwise behave with jest. 

  • To inconsequentially toy with something. 

noun
  • A particular kind of pewter. 

  • Anything that is of little importance or worth. 

  • An insignificant amount of money. 

  • A very small amount (of something). 

  • Utensils made from this particular kind of pewter. 

  • An English dessert made from a mixture of thick custard, fruit, sponge cake, jelly and whipped cream. 

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