Any diversionary activity that requires a fair amount of effort and absolutely no brain power; generally makes the person doing it look slightly stupid.
Building a house of index cards? That's fun for the feebleminded if I ever saw it.
Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.
"Base we've got some square groupers floating outside of Miami harbor."