the act of sitting on the face of another and pressing their face into your bare ass while clenching, while doing so it is necesary to shit into their mouth... taco shit are preffered but any will do.
When a women is giving either a man or a women a rimjob (licking of the anus) and the man or woman recieving it shits all over the women's face, giving her a beard of shit on her face.