In England the term 'joyride' generally refers nowadays to a car having been stolen by young people (joyriders) and driven at high speed for fun frequently causing damage to the car and anything else it comes into contact with. herrSaibot is correct with the original meaning of the word.

Joyride can also mean driving a car really fast for excitement, or sometimes people steal a car just for fun.

Joyride is a noun and means to ride a car with no particular goal and just for the pleasure of it...