Mastodawn

TIL going "balls to the walls" originates from aviation lingo

I never knew and got curious and looked it up. I guess it makes more sense than slamming your testicals against the wall.

I’m pretty sure it was from trains first

You may be thinking of "balls out" which refers to centrifugal regulators that are usually used on steam engines.

I just assumed it was an exaggeration. Putting the balls to the wall meant having them wide open