Ponyfucker Share definition Flag a person who has sex with a small penis,unlike a horsefucker who has sex with a huge penis. That girl cant take a penis, shes such a Ponyfucker.fucker Ponyfucker by B-cubed0676 December 31, 2009 0 0 Get merch Get the Ponyfucker mug. Buy Now — $32.95 See more merch