giving oral sex to someone while they are having an explosive bowel movement and the blow back from the psi levels splatters the face of the head giver
blow back(e.g.) when you drop ass and shit splashes your ass and the bottom of the seat. combine that with oral sex
and you'll get fecalatio
The act of receiving feces from an anus with only the use of one's mouth and then subsequently while the mouth is full performing felatio until orgasm.
"That chick was totally freaky. Not only did she start rimming me but she demanded I shit in her mouth and then she performed fecalatio on me!"