The result of cooling of the testis. The scrotum rises, shrinks and hardens, resembling a tortoise shell. Often goes hand in hand with shrinkage of the nob.
Steve, "The water is freezing today."
Morty, "Yeah man, I got a tortoise shell"
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.