What does I’ll turn this car around right now. mean?

See a translation

That phrase is said by parents to their children. It is a threat parents use sometimes. For example: The parents are taking the children to do something [the children] want to do. The children are in the back seat of the car and they are not behaving. The parent then says something like: “If you two don’t stop it right now—I’m going to turn this car around and we are not going to ～place” meaning that they would return home and not get to have fun. I am not sure if it is a phrase that is used much anymore. Many people have devices, like tablets or phones etc., to entertain children.