ass jousting 

When two males put on helmets and one runs full speed at the other with the hopes of getting his dong in the others ass. A less fun version involves a male and female. Also referred to as lanceless jousting, it was common in the medieval times before man invented horses.

Dude: Hey Ben I've been craving some ass jousting for the past couple weeks how bout you?

Ben: Me too my butt's felt way too tight recently, how does tonight sound?

ass jousting by googenmcblaxton September 19, 2012

Ass Jousting 

To ram or punch asses together in an synchronous motion, and moaning like a dead fish

mike smith got caught ass jousting with a black kid from georgia

Ass Jousting by Daniel December 14, 2003

Ass-Jousting 

A sport involving two competitors who attempt to knock down their opponent by scuttling down the playing field and bumping each other with their asses.

Ass-jousting is best played at 2AM with bored college students, not looking for sexual games.

Ass-jousting is the best sport ever!

Ass-Jousting by Hulla December 14, 2008