1. An intentional secret protrusion of the scrotum sack through the fly of a man's pants. This is done to induce shock or laughter from the intended target. Many innocent bi-standards may be injured after seeing this.
John: "Damn it! Joe pulled out his stealth balls again last night. It caused Jane to almost throw up all over me!"
by nakdau March 24, 2010
Noun, property of a motor vehicle, which, while it doesn't slam you back into your seat with acceleration, nevertheless reaches surprisingly high speeds with little or no sensation of speed.
My sister's Camry has Stealth Balls, I was driving down the street, glanced at the speedometer and was doing 80 in a 25 zone.
by BB5710 November 29, 2012