Beach patrol code name for black person at a beach who you automatically assume can not swim. Usually travel in large groups which then would be called a school of rock fish. Can be heard from far away due to lack of normal access to beaches and overbearing excitement of the beach. Commonly used when black person is present around any body of water.
John: hey keep an extra eye on those people over there.
Rick: oh you mean the school of rock fish
Dad: how was the beach today?
Me: horrible had to go in after the same rock fish like five times cause he fell off his boogie board