An obsession with shit.
Kyle Broslovski had fecalphilia. He kept seeing Mr. Hankey, the Christmas Poo. A Fecalphiliac is someone who's obsessed with "mookie stinks".
Fecalphiliacs have an insatiable appetite for shit.
Cousin Craiggers is a fecalphiliac, he munches Fecal Flakes for breakfast every day!!