The burning feeling in the anus after taking a dump, after consuming chile or other spicy foods.
See also: Ring of Fire
Man, this chile is so damned hot. I'm gonna have gringo butt tomorrow for sure.
Severe diarrhea caused by ingesting food or water in Mexico.
I ate some tacos from a street vendor in Tijuana and I'll be damned if it didn't give me the worst case of gringo butt I've ever had.