Rather large balls contained within a translucent ball sack. The balls are extremely hairy, thus resembling the many tentacles protruding from the body of a jellyfish. Such hair can scratch another during intercourse similarly to the stinging of a jellyfish. It is recommended to keep a distance from those with jellyfish balls. Those with this condition usually have sloth-like features, say "brah," ride bicycles, fix computers, and have no car.
That guy last night had huge jellyfish balls; I have the worst rash!