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3.
Adjective

Agressive and edgy. Badass. Balls on board; as in full of testosterone. Pronounced with the stress at the word "on" as in "Balls ON".
He: "I finally finished fixing the rear main seal on my '76 Chevy K20 with a big block 454 engine - wanna go for a ride?"

Me: "Man, this truck is balls ON!"



"Hey, did you see Janie's new full-back tattoo? Her ink is balls ON!"
by MuddyRunnerGirl March 09, 2009
 
1.
1. Overtly and possibly excessively enthusiatic.
"Rover was freakin' balls on for the lamb shank; he'd practically dry hump the thing while chewing on it."
by dinobuddy December 22, 2006
 
2.
exactly acurately placed
I'm tellin' you, that foundational wall is fuckin' balls on.
by r.a. lipman February 19, 2004