Balls

A slang term for the word "testicles." Which scientifically defines "A spherical or approximately spherical body or shape object that exists as a portion of the lower human body, That is rounded or protuberant."

Me: Did you know that a normal pair of balls has an average circumference of 6.5cm?
My Friend: No!

Me: Because I just made that up and everybody has a unique pair of balls!