The unique aroma of a taxi cab that an unfortunate customer inhales after closing the door caused by the driver sleeping in the cab after hours when he is off duty thus leaving the stench of unwashed, moist and sweaty balls.
A condition developed by males after repeted pummeling of their testicles (either from fighting, or from smacking violently against a partner during sex)
Ex 1. Did you watch the game last night? Tom Brady was sacked so many times by Saints defenders, I think he might have tankballs this morning.
Ex 2. I bent that chick over my desk and fucked her so hard, I have a mean case of tankballs.
Another comical and witty name for testicles. Referring to testicles as testaballs usually guarantees a laugh or two from everyone around you.
Person 1: Oh dear, you seem to have struck my testaballs.
Person 2: Haha excuse me, I slipped on this slick floor, i'm sorry that I kicked your testaballs.
Person 1: Haha, it's alright.
Person 2: Goodbye.
Person 1: Goodbye.