Something you don't tell your mother you are doing when you are going out driving with buddies on Friday night because she'll freak shit and not let you go.
"No, I'm not letting you out! I don't want you getting into an accident like those teenagers on the news! Joyriding is dangerous!"
"Idiot! Why did you say joyride? You should have said you were going to McDonald's or something. You know your mom worries! Kidding me? Fucking... joyride... idiot!"