An adhesive label or decal, usually applied to the bumper or back end of an automobile, and displaying a short political, promotional, philosophical, or humorous message
He has a bumper sticker on his van that reads faster than a speeding ticket.
A bumper sticker is a small piece of paper or plastic with words or pictures on it, designed for sticking onto the back of your car. It usually has a political, religious, or humorous message. a bumper sticker that said, `Happiness Is Being a Grandmother'. A sticker bearing a printed message for display on a vehicle's bumper. a small sign on the bumper of a car, with a humorous, political, or religious message