Montezuma’s revenge , n :
(humorous) Diarrhea experienced by tourists after drinking water or eating food in Mexico as a result of a bacteria strain to which native Mexicans are immune. Aztec ruler Montezuma or Moctezuma II met Spanish conquistador Hernán Cortés for the first time on this day in 1519.
Source http://handbookblogger.blogspot.com/2017/11/montezumas-revenge-word-of-day-for.html