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Diarrhea contracted while traveling abroad—especially in Latin American countries—due to being unaccustomed to the local cuisine or quality of water. I was having a great time in Mexico, but I came down with awful tourista for the whole second week of my trip. Make sure you only drink bottled water if you don't want to spend the whole time on the toilet with the tourista.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.