TIL going "balls to the walls" originates from aviation lingo
https://lemmy.world/post/23358584

TIL going "balls to the walls" originates from aviation lingo - Lemmy.World
I never knew and got curious and looked it up. I guess it makes more sense than
slamming your testicals against the wall.
Going “balls out” refers to governors on steam engines which used centrifugal force on a pair of balls to regulate the speed of the engine. At full speed the balls were out at the maximum.