The highest possible level of an uncontained explosive bowel movement, Unlike a 1st or 2nd degree episode, the 3rd degree will always make its mark down your pant leg, on your chair or in the shower. Nothing can be done but to clean up the inevitable mess.
Jim: That was some fine chili we had at dinner.
Bob: Yes it was, but it set a bit funny with me.
Jim: Set a bit funny? How so?
Bob: Well... (running to bathroom yet loosing bowel control 10 feet from his salvation).
Jim: Oh sweet Jesus in Heaven! Mary get your mom's adult diapers Bob's had a full 3rd degree blowout!