Horse Trailer

an extremly unatractive woman who has a primal atraction to mentally challenged people, she owns her own hoarse and drives it around in her hoarse trailer, her daddy will try to keep her away from her boyfriends, but all she will say is "YOU CANT STOP ME DADDY I LOVE HIM" she is mortal enemies with what is only known as the darcy wildcat, who can transform between jenna, darcy, jendar, and wildcat darcy who shares the same twisted fetish for mentally handicapped people

Verb. To perform a horse trailer you need a truck with a rollbar, a horse trailer behind said truck, a friend to drive the truck, and obviously some nasty ho. What will be done is the ho is tied to the rollbar of the truck, with you pounding the bitch from behind, your friend drives the truck and trailer down the road, while the girl whinnies like a horse.

noun; an ass from the side it resembles a horses hindquarters

A horse that you can use as a trailer. Also you can ride it on top of trailers. You can also substitute a bad word and put in trailer horse for it.