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1.
Polite euphemism for horsefucker, often used at dinner parties and other genteel events. If Eric Cartman had said this he wouldn't have been shocked by the V-chip.

Not to be confused with pony smacker.

It might be possible to combine horsemounting with sado-masochism and necrophilia, but that would just be flogging a dead horse.
"I really don't get disgusted by a bit of immaturity in a game. I got a chuckle playing Horror of Rylvania when the game called me a pervert for trying to fuck the horse. Mostly just because it was unexpected. And hey, *mounting* the horse actually netted me a useful item!

MH (the horsef...errr....horsemounter)"
(from rec.arts.int-fiction)
by Anuspounder June 12, 2008