When your diaper is so full that it is leaking poop down your leg.
That babies diaper is so full and over flowing, there is diaperrhea all over the place. It's in my shoes!
When you have uncontrollable diarrhea and need to wear adult diapers; or you are wearing diapers and have diarrhea
I just had diaperrhea
Having diaperrhea is just so gross, you have diarrhea inside your gross diaper.