Rubinstein is the German word for Ruby Stone. This is a very stereotypical Jewish, and German name. Chances are all of the people you meet with the last name Rubinstein, are Jewish.
Bob Rubinstein is a GermanJew who goes to his temple every sabbath.
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."