When a person commits the act of deficating in the other person's mouth via ATM(Ass To Mouth) as the second person lays on the floor with mouth wide open like a human toilet. The person laying on the floor must lay on back. To complete a Hatian Exchange, the person deficating must pull the other person's ear to "flush the toilet". The person who is on the floor then goes on to swallow the feces while making sounds of a flushing toilet.
As I was being escorted to my prison cell, the guys in cell block P were doing Hatian Exchanges.