The act of ejaculating upon a pumpkin, lit or unlit, carved or uncarved. This activity is most commonly performed in the midwest as an act of love towards pumpkins, or as an act of tribute to Trick or Treating.
Damn dude, did you see the pumpkins at her back-door? Make-a-brutha wanna punkaculate right now!
It is said of the situation where a person has the bad luck to make contact with his testicles against an undefined surface or object, intentioned or not.
Given the nature of the word, it is more appropriate to design cases where the interaction is made with a moving object, for example, a ball.
Although it is extremely painful for the victim, it tends to be considerably funny to people who witness it.
Today in the baseball game the pitcher took a nutshot; the baseball hit him in the nuts.
Man, I just watched the funniest nutshot video ever.