montezuma's revenge

noun Slang.

1. traveler’s diarrhea, especially as experienced by some visitors to Mexico.

noun

1. informal an acute attack of infectious diarrhoea, esp when experienced in Mexico by tourists

“severe intestinal infection,” such as often suffered by non-natives in Mexico, 1962, in reference to Montezuma II (1466-1520), Aztec ruler at the time of the Spanish conquest of Mexico.