Capital city of the male groin. Once known as "The land of the free and the home of the balls," Scrotumberg is now widely accepted as one of the itchiest places on Earth. Famous residents include stickball legend Ballsack Johnson and Greek-esque philosopher Testicles (pronounced tes-ti-kleez).
Similar to a teabag. Whenever you sneak up on someone while they are sleeping and stretch your sack over their face like an umbrella. Thus, the scrotumbrella.
Man, I snuck into Jeremy's room and gave him a scrotumbrella all over his mouth.