cold cash vs lettuce

cold cash

noun
  • Money, especially in the form of paper currency or coins, which is in hand or readily available for use. 

lettuce

noun
  • United States paper currency; dollars. 

  • long hair, as worn by an exemplar of bro culture 

  • The leaves of the lettuce plant, eaten as a vegetable; as a dish often mixed with other ingredients, dressing etc. 

  • A strong yellow-green colour, like that of lettuce (also called lettuce green). 

  • An edible plant, Lactuca sativa and its close relatives, having a head of green and/or purple leaves. 

  • weed or marijuana 

How often have the words cold cash and lettuce occurred in a corpus of books? (source: Google Ngram Viewer )