The thin and dirties

The term used for when you leave a right mess in the toilet bowl, especially the runny form of your shit- otherwise known as diarrhea.

"Aghh, those chips and salsa, 4 candy bars, and a liter of soda didn't sit well in my stomach. Gave me the thin and dirties!"

Person A: "Hey your pants are all brown on the back."
Person B: "Yeah, I've got the thin and dirties."