When you have the shits so bad and you almost can't take the runny, burning liquid; you begin to dig your toenails into the floor, to prevent yourself from screaming in pain. Usually accompanied with a terrible smell and loss of digestive and colon tract.
Dude, Jenna, did you hear?" "No, what is is, Marissa?" "Steven was in the bathroom for almost an hour." "Oh wow, he had toenail diarrhea again, he needs to stop eating that damn Mexican food.