A room for holding balls in, as in a formal dance. Normally found in larger older houses or mansions, not generally found in modern houses, due to the fall in popularity of formal balls. Think chandeliers and shining polished floors.
The room left over in the crotch area of your pants when they don't fit exactly right. The amount of extra space may hold anywhere between three and twenty "extra" testicles
"Stacy, I don't think those pants fit you quite right."
"Oh god I know! Perfect on my ass but look at all of this ballroom!!!"
*proceeds to fiddle with excess fabric for emphasis