The pants are to be worn UNDER your regular pants, (replacing underwear) and are used to collect your explosive diarrhea. When you have filled up your D-Pants, it is absolutely correct to take them out back, hose them off, and re-use them. No solids please.
Jimmy: "I am SWELL, did you hear about the new D-Pants?"
Johnny: "Why CERTAINLY, I am filling mine up right now as we speak!"