A joyride is a speedy car ride you take just for fun. Joyrides may sound like fun, but they are usually taken in stolen cars and could therefore land you in jail. Try finding your joy elsewhere!
While you can say, "Let's go for a joyride!" when you're inviting a friend for a spin around town in your red convertible, the word usually implies something less innocent. The criminal kind of joyride involves stealing a car for the sole purpose of driving it, fast, and then abandoning it. Taking cars for a joyride was a more common crime in past decades, before car alarms and other theft-prevention devices became commonly used.