Verb: to scrote.
The act of placing your testicles back inside your body (as they do when
cold) leaving nothing but your scrotum
skin hanging down. You then place this loose
skin between both of your hands (or indeed, your partners hands) and rub back and forth to create friction.
Inventive new torture, or fun masturbatory aid? You decide.
Bored of his usual technique, Sam decided to
go scrote one off with his friend,
Sean.