to tackle someone's testicles, resulting with the person lying on the floor writhing in pain and cursing the nutsacker's existence to the depths of hell.
Man, that guy was so mad, I though he was going to nutsack me in a dark corner of the room.
The piece of cloth stitched into the interior layer of pants, shorts, and trousers, creating a cave which is often used to hold miscellaneous items. It is also colloquially referred to as a "pocket".