When your testicles are in a state of severe hibernation. Your sack is scrunched up as tight as it will go, often seen during colder weather or after having taken a swim. The exact opposite of this would be Pirate Balls.
It was five below zero out, and my Scrouge Balls were starting to ache.
She stared at me with a look so cold that my pirate balls quickly turned Scrouge Balls.