Nova Scotia Trench Coat

A Nova Scotia trench coat is where a person is in a comatose state, usually alcohol related, at which point you proceed to remove their trousers, deficate into them, and pull them back on to the original owner.

Person #1: "Hey Bill, I got black out drunk last night and someone shit my pants."
Bill: "Sound like you were the victim of the ol' Nova Scotia trench coat."