The feeling of needing to go to the bathroom after getting hit in the balls.
The occurrence in which a gentlemen sustains crippling damage to one, or both, of his testicles to such a extent he can no longer retain feeling in his body below the waist. Or anywhere for that matter; most commonly caused by sitting on ones own nutsack.
"oi what happened to Barry?"
"poor bloke went and Dead Balled himself."