diarrheagret

The specific type of regret that follows after eating a meal that does not agree with you, and typically you get diarrhea (or constipation, or god forbid a horrid fusion of the two that results in the shotgun shit).

After eating that awful burrito with six different hot sauces you sit on the toilet and have diarregret, and with every splash you hate your past self just a little more.

"Shouldn't have gotten that indian food man...I got diarrheagret"