a man only having one testicle

A pen making company

An odd attraction in the form of a online game that draws out all nerds, geeks and people who generally don't shower.

condition in which instead of having two testicles a man, they're so small that they appear like they only have one. which is usually an insult if you hear a girl talking about her boyfriend's uniball

Having one testicle inside of the scrotum instead of having the usual two. This normally produces half the amount of semen as having two.

When you get a really good atomic wedgie, you can lose your ball in your stomach.

When you have one testicle tightly packed in your ballsac to the underside of your cock