The term 'COP CLUB' is a reference to a group of police officers who use nightsticks as their primary weapon. Nightsticks are long, straight sticks made of wood or metal that are used by law enforcement officers to control crowds and subdue suspects. They are also known as truncheons, batons, or billy clubs. The term 'NIGHTSTICK' is derived from the fact that they were originally made of hardwood, which was often painted black to make them look like a NIGHTSTICK.