Most often, a band of little musical talent or significance whatsoever. Usually, the type of band which your one crazy, musically incompetent friend listens to and rips guitar tab from off the internet in an attempt to impress others who could not tell the difference between a Really Shit Band and the sound of their own head imploding from horrible sounds the rest of us are subjected to.
I kicked Mark in the balls and he sounded like a Really Shit Band.
Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the USCoast Guard in the area of Southern Florida.
"Base we've got some square groupers floating outside of Miami harbor."