When 2 people (normally male) try and shoot each other in the nuts with a nerd gun, an other variation includes nut blaster extreme where you take an airsoft gun and try and shoot each other in the nuts
When a somewhat round projectile is thrown directly into your scrotum, causing pain that can only be described as a nutblast. The 'testicle' part comes from both the shape of the object, and to help specify which kind of nut is blasting (as opposed to an edible nut, or nut (meaning to ejaculate))
Man 1; Dude, my girlfriend was so mad when I forgot to let the dog out to wizz, that she gave me the biggest, most horrendous testicle nutblast of my life!!!
Man 2; Ohohoh dude I can feel it! I can only imagine! Rip future kids!!
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.
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.