According to Urban Dictionary:
"Felching (fellare: to suck) refers either a) to stuffing animals into the vagina or anus, or b) to a partner sucking semen out of one of these orifices. It is not an homosexual term."
(BTW I like how the author here is careful to note that homosexuality is not involved - I suppose because then it would be really disgusting...)
So, which act is being performed with/to the donkey in the above sentence?
sorry, it's been a long day