Green’s Dictionary of Slang

stomach troubles, diarrhoea; orig. that contracted in Egypt, but now ext. to any such problems that UK tourists experience abroad or in ethnic restaurants at home.

1934		Palestine Post 8 May 3: Much is heard of ‘Gippy tummy’ which is supposed to be caused by the climate, but I think a Health Week, during which kitchens and cooks were inspected would do a lot to reduce dysentery here in Egypt.
1941		H. Ranfurly diary 10 Apr. in To War With Whitaker (1994) 85: Doctor Moore says I have gyppy tummy and chicken pox.
1941		Aberdeen Jrnl 20 Aug. 4/7: Most newcomers get a ‘gippy tummy’.
1943		M. Harrison Reported Safe Arrival 108: Gyppo gut, enteric, cholera, and Heaven knows what.
1947		D. Davin For the Rest of Our Lives 196: Do you remember, Fred, how you had your pants down with gippy tummy when the Jerries broke in that time?
1958		Tatler (London) 24 Dec. 19/2: Both of us ught to have been stricken [...] with the virulent Greek variation of ‘Gypy Tummy’.
1960		Wash. Post and Times Herald 10 Apr. L6: The disorder occurs often in Mexico and has been nicknamed Montzuma’s revenge [...] In Italy, Turkey, Egypt and India it is named Turkey trot, gippy tummy, and Delhi belly.
1968		Punch 8 May 657: Another sufferer was King Hussein, who followed talks with Nasser with a spell in a London hospital, due to a stomach ailment. Gyppy tummy?
1977		(con. 1940s) O. Manning Danger Tree 81: She knew she was in for another attack of ‘Gyppy tummy’.
1984		Hope Star (AR) 23 June 3/5: Turista is the diarrhea of travellers [...] also called the Aztec two-step [...] Gyppy tummy and the GI trots .
1984		Guardian 7 July 27/6: [advert] Why the hassle of going overseas? We all know the problems of gyppy tummy.
1990		Sydney Morn. Herald 15 Feb. 15/1: I have never heard of anyone getting gyppy tummy in Singapore.
1995		D. Lodge Therapy (1996) 214: More likely something to do with Egypt, as in ‘gyppy tummy’.
2002		Gavin Thomas & Karl 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.
2014		Santa Fe New Mexican (NM) 5 Aug. A-10/4: Euphemisms for the thing — Gandhi’s revenge, Gyppy tummy, the Rangoon runs, Tokyo trots [...] Montezuma’s revengs.