Fun bus is open

your done for if you come across this as a killer

Adam: FUN BUS IS OPEN!

That one kid in the party: oh he’s done for

Open Ear

The ability to listen to any music genre and sounds around you and appreciate and like it

Hey man weren't u listening to classical music this morning now extratone and you sleep with harsh noise?

I just have an open ear buddy

Open Ball

Given a metric space X with a point x in X, an open ball of radius r (a nonnegative real number) is the set of all points y in X such that d(x, y) < r

"Don't kick those open balls"

Open dump

the noise that a forced induction vehicle makes when the air pressure in the intake system releases under vacuum-or "letting off the gas" after you built boost.

That sweet ass Mazdaspeed_3 just open dumped on the state troopers window.