Jimmy left the Halloween Party with the naughty nurse and she gave him a pumpkin blumpkin! He burned his ass on the candle, but it was totally worth it.
The standard blumpkin affair with a twist: instead of the usual mouth hug while taking the browns to the super bowl, she (or he if you're so inclined) dons a jack-o-lantern (preferably of the toothless persuasion) and then blumpkins you to orgasm. It's a seasonal thing - like the bj version of the shamrock shake.
To sit on the top of the toilet and take a dump in it, while a girl is sitting backwards on the bottom. She is taking a dump and wearing a pumpkin on her head while giving you dome.
a variation of the blumpkin. You carve a pumpkin with a large mouth hole (no eyes, just mouth), and you put it on someone's head, they then proceed to give you a blumpkin. see blumpkin