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

Dirt jumper 

1. A person who rides a medium sized fixed gear cycle that forms the look of a bmx bike with suspension, they are considered to be the most badass style of rider and they get the most pussy

2. A style of bicycle that is used to participate in dirt cycling and tricking

My boyfriend is a dirtjumper and I want his cock all the time.

I am trying to get my girlfriend to buy a dirt jumper but they are very expensive

Dirt jumper by AirMtb April 9, 2015