Green’s Dictionary of Slang

Aztec adj.

In compounds

Aztec hop (n.) (also Aztec two-step) [its supposed provenance in Mexico]

diarrhoea.

1953		S. Sherman [bk title] Aztec Two-Step.
1965		J. Arthur Aztec Trek 47: The ‘Tourista,’ also known as ‘Montezuma’s Revenge,‘ the ‘Mexican Quick Step,’ or the ‘Aztec Hop,’ (and aptly so) can be totally disabling.
1967		B. Mack Bachelor’s Guide to Mexico 48: The Aztec Two-Step or Montezuma’s Revenge [...] is the dreaded scourge of the tourist.
1972		Time 22 May 104: South of the border, it is turista or ‘the Aztec two-step’. In Asia, visitors from the West call it ‘Delhi belly’.
1979		Maledicta III:2 166: Aztec hop n Dysentery.
2002		Thomas & Bettelheim E. Coli Index 🌐 Travellers’ diarrhoea, a condition which has gone under a variety of regional and descriptive titles, such as gyppy tummy, Aden gut, Delhi belly, Hong Kong dog and Aztec two-step.

Aztec revenge (n.)

diarrhoea.

1976		Trailer Life XXXVI 76: Everyone has heard about the ‘Aztec Revenge,’ the ‘Cucaracha Quick Step’ and other names they have for upset stomach and other intestinal disorders.
1980		J. Wambaugh Black Marble 152: With his luck he’d die of Aztec Revenge anyway, first time he had a Bibb lettuce.
2000		Chattanooga On the Move (Spring) 1:2: Upon arriving at the park, I was hit by what, in the interest of good taste, I will refer to as the Aztec revenge.