Montezuma's revenge
Concise Oxford English Dictionary © 2008 Oxford University Press:
Montezuma's revenge /ˌmɒntɪˈz(j)uːməz/
▶noun informal diarrhoea suffered by visitors to Mexico.
– origin 1960s: from Montezuma II, the last Aztec emperor.
'Montezuma's revenge' also found in these Oxford entries:

