You've Got To Be Kidding.

There is a word in the english dictionary to specifically describe the act of eating ones poop.

Coprophagia. Yup, that is a fancy way of saying "poop-eating".

Just the other day, I was trying to think of the word, it was on the tip of my tongue, but it wouldn't come to me...but alas, it was coprophagia. Duh.