Loonesmen Posted in L Best definition Loonesmensports A person who stands on the outside line of a game, most likely a sport, and calls out stuff to make people angry. eg. YOUR OUT and BOO YOU SUCK! The Loonesmen of this soccer game was really letting the players down How satisfied are you with the definition? Looking for Loonesmen meaning? Delighted that you discovered the greatest determine on our web site! Recently this definition was actually observed 40 times.