double Dutch vs toffee

double Dutch

noun
  • A game of jump rope with two ropes and frequently two jumpers. 

  • A language game akin to pig Latin. 

  • Incomprehensible language. 

  • Sex using a condom and the contraceptive pill at the same time. 

toffee

noun
  • A small, individual piece of toffee. 

  • Any kind of sweets; candy. 

  • A type of confectionery made by boiling sugar (or treacle, etc) with butter or milk, then cooling the mixture so that it becomes hard. 

verb
  • To coat in toffee. 

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