pop quiznoun [ C ]
uk/ˈpɒp ˌkwɪz//ˈpɑːp ˌkwɪz/UK a game or competition in which people answer questions on the subject of pop music, or a television show that includes such a game
US a short, informal test that is given without any warning :
We all remember the dreaded pop quiz from school and how it sometimes created that sinking feeling of being unprepared.