dirt jumping 

To jump dirt. A style of biking that consists of jumping tall jumps usually made of dirt and clay. They will often have a gap that must be cleared. Dirt jumping also includes many different tricks, and is usually done one a Dirt jumping bike. Lightweight, with fairly flat tires, and very light.

Damn, lets go dirt jumping and huck some huge ass dirt jumps!

dirt jumping by Tyleronie June 19, 2008