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.

Got the covid-19 vaccine

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

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.