Balls out

to exude tremendous effort, to try extremely hard.
i decided to slack off and get a b in the cl-ss, but ross went b-lls out and got a 100%
originally referred to the governor on old steam engines that had two ball that rotated across one another that would control speed depending on how fast they spun. b-lls out meant going full speed or power.
that old steam tractor was going b-lls out.
this refers to the governor on a steam engine. two heavy b-lls are attached to the engine so that as engine speed increases, the centrifigal force of the flywheel causes the b-lls to rise. as the b-lls top out, they govern (limit) the engine, thereby controlling maximum engine speed. “b-lls out,” then, refers to running the engine at maximum speed.
the engineer was running the train at a “b-lls out” pace while trying to make up time.
giving your all in a certain situation, being courageous
you should’ve seen me out there, i started to choke but then i went totally b-lls out.
a unit of measure regarding to the top end speed of something.
when asked by the officer how fast he was going bill replied “im not sure but it was pretty b-llsout.
old timey terminology: on steam engines, they had steel b-lls in there that resricted steam flow. when the conductor was ready to pick up speed, he’d yell “b-lls out!”, signaling the help to do just that, thereby letting them haul some -ss.
“b-lls out! we got to mow down those hobos!”
b-lls out means many things. 1. literal b-lls out of pants 2. no fear 3. goin for it 100%
it’s what we are. steel panther is b-lls out.

– stix