Green’s Dictionary of Slang

apple-blossom two-step n.

[? play on sour-apple quickstep; one of many sl. terms for diarrhoea that pun words for dancing/movement (i.e. SE trot) on trots n.]

diarrhoea, often contracted on a foreign holiday.

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[US] in DARE.
Cycle Yourself Fit 🌐 Presumably you’re talking about the apple-blossom two-step (to pick one of the printable nicknames). Travellers’ diarrhoea is indeed an embarrassing, albeit very common, problem.