While your bangin' a phat chick in the tailpipe on a balcony, you pour orange paint all over her rolls, shout "FIRE IN THE HOLE", then punt her ass off.

When you eat dirt for the first time and leave your family to build a shack in the woods

The act of having a sexual act "doggy style" and then putting a hollowed out pumpkin on the recipient of the "doggy style". Then once the recipient looks like that sleepy hallow dude, one humps the monster through a wall. Thus the pumpkin chunk.