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?
by googenmcblaxton September 19, 2012
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When a male and female are dancing, or grinding, and the male proceeds to get an erection, which he willingly allows to "poke," or joust into the female he is dancing with, sometimes causing awkwardness
Becky: "So I had so much fun at the club last night, did you?"

Melissa: "Well, this guy I was dancing with totally ass jousted me for like ten minutes before I pepper-sprayed his ass."
by Bean of the Chilli October 22, 2008
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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
by Daniel December 14, 2003
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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.
by Hulla March 10, 2007
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