the act of placing a womans soaking undergarments in her mouth while riding her like a horse.

The fastest moving vehicle..thing known to man, traveling at a pace faster then the speed of light it fears nothing/no one.

The most well-known horse acting in Hollywood at present. Famed for playing human parts, most notably the lead role in Sex and the City.

When a male ballsack slaps the inner thigh. It can usually be done on purpose with the legs spread and producing a swinging motion.

One can do it to another in some cases when the leg is kicked so hard that it acts like the newton pendulum.

To have doggy style sex with your partner as if riding a horse.
Not sexuality specific, strap-ons acceptable
Spanking is also not only acceptable but encouraged
Seabiscuit refers to the horse-racing film starring Tobey Maguire

A yanki sea whore

When a woman sits on a mans face and rides his mouth either via the pussy or arse or both