Montezuma's revenge vs lax

Montezuma's revenge

noun
  • Diarrhea experienced by tourists after drinking water or eating food in Mexico as a result of a microorganism to which native Mexicans are immune. 

lax

noun
  • Lacrosse. 

  • A salmon. 

adj
  • Lacking care; neglectful, negligent. 

  • Loose; not tight or taut. 

  • Lenient and allowing for deviation; not strict. 

  • Describing an associative monoidal functor. 

How often have the words Montezuma's revenge and lax occurred in a corpus of books? (source: Google Ngram Viewer )