A well-placed and extremely hard blow to the testicles. Done correctly, a nutbuster will incapacitate even the strongest man for several minutes. Best results are usually achieved with a kick, using the laces of any sturdy shoe. Other methods of nutbuster delivery include a baseball on the end of a rope, knees, or even a strong punch.
She gave me a nutbuster and I was writing in pain on the floor for 10 minutes.
A nutbuster plus is a fat chick who likes it on top, and gets into it so much that she generates additional inertia and momentum and completely flattens your balls.
Psarah, who weighs about 563.4 pounds when dry, is an absolute nutbuster plus.