I believe it is Fecal Material Transfer?

Fecal Microbiota Transplant. The process of using a donors stool to equalize / improve gut flora. Over time, through the consumption of processed foods, sugars etc is thought to remove the "good" flora and feeds the "bad" flora. Things like smoking, not exercising, lack of sleep, antibiotics, alchohol also contribute to the health of these "good" and "bad" flora. Using a donors stool is a straight-forward way of supplying the gut with flora thought to balance the immune system and reduce the number of bad flora responsible for a potential litany of bad-juju.