Receiving a blow job while pooping into a jack-o-lantern.
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.
It was Halloween night and I could tell magic was in the air when a jack-o-lantern was giving me head on the toilet, the old "pumpkin blumpkin"
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
"lilPete was the first man ever to recieve a pumpkin blumpkin."
The same as receiving a classic blumpkin (a blowjob while taking a dump) BUT with the slight variation that you ask the nice young lady or man to wear a jack-O'-lantern on there head while they do it.
Dude you know how I got rid of all of my pumpkins after halloween? I had my girlfriend give me a pumpkin blumpkin everyday this week!