Another term for a motorcycle. Mainly a blue collar and or redneck term, although the two are not synonymous. You will hear this term most often said in regard to a chopper or bobber.
Clint: Hey man, gonna ride the ball bearing jackass to school today?
Ed: Nah, that'd be a death wish today with how slick the roads are.
By Tammy
Ball Bearing Castle
1) A girl who hardly ever leaves the house yet is able to hook up with many guys, thus bearing the balls in her castle.