Iraqi Trail Riders (actually mostly dirt jumping).
http://www.youtube.com/watch?v=oBTQcZ2gBTQ
http://www.youtube.com/watch?v=oBTQcZ2gBTQ
That was frickin' awesome! When I first heard what song was saying, I was like, "Oh, this is going to blow." Then I started laughing, and pretty much couldn't stop. Truly rad!