gippy tummy
noun [ C or U ] UK informal uk/ˌdʒɪp.i ˈtʌm.i/ us/ˌdʒɪp.i ˈtʌm.i/
热带腹泻（尤指当度假的时候，遭遇胃疼和腹泻）
an occasion when you suffer from stomach pains and diarrhoea, especially while on holiday
It's a shame - he had (a) gippy tummy most of the time he was away. 真可惜——假期的大部分时间他都在拉肚子。