noun. Conjugalicious relations with a horse, resulting in romance or death.
Related terms: cousincest, dormcest, dogcest, floorcest, horsecest, housecest, momcest, siblingcest.
Real citation: "eww, horsecest."
(Lyvianus, June 6, 2005, http://yaoi.y-gallery.net/comment/164119/)
Made-up citation: "As the Bible says, 'The snorting of his horsecest was heard from Dan: the whole land trembled at the sound of the neighing of his strong ones; for they are come, and have devoured the land, and all that is in it; the city, and those that dwell therein.'"