N. The result of a Mt Dew dependent little kid winding up and socking a male adult in the family jewels.
The stunned man stood the rest of the day in the soccer penalty shot position out of fear that the little spider monkey kid would lay another junk punch on him.
v. The act of punching a person, usually male, in the genital area. Also can be abbreviated to JP.
Stop being an ass or else I'll junk punch you.