An act in straight/gay intercourse in which two large men alternately pound the rectum of a small-framed woman/man, usually leaving the receiver with a red, swollen sphincter. The enlarged asshole resembles a gourd, giving it the apt title of a "pumpkin."

In this rare case, the damage is doubled, hence the name.
Julie approaches Barbara with a limp, nursing her ravaged body.

Julie: Last night Steve and Craig came over and jammed my bum tenfold.

Barbara: Ah, got The Double Pumpkin, eh?

Julie: Total double pumpkin action.
by Vance Covelton November 7, 2009
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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.
Friend 1: Heather came over and gave me a double decker reverse pumpkin blumpkin on Halloween.
Friend 2: Dam shes notorious for that.
by jrizzel July 29, 2014
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