(~s)
A ~ 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 ~ that said, ‘Happiness Is Being a Grandmother’.
N-COUNT
BUMPER STICKER
Meaning of BUMPER STICKER in English
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012