Crude humor that is almost always associated with defecation, urination, flatulence, and vomiting. The occasional exception occurs while combining sexual and bathroom humor together, resulting in some pretty outrageous shit.
After I saw two girls one cup, I puked and ate it again, attempting to prevent any further mind fucking from the atrociousness that is now branded in my brain until the day I die. It was somebody's sick idea of bathroom humor.
Elvis died on the toilet, trying to pass a turd. An early example of bathroom humor.