To take a dump while recieving oral from pumpkin instead of a girl, or A different form of masturbation.
Joe Couldn't get plumpkin from a girl so he got a plumpkin pumpkin instead.
by Jon and Brett April 17, 2008
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The rare art of receiving fellatio from a willing rotund woman while simultaneously shitting, wearing the head of a pumpkin costume and consuming bacon.
Matt: "Dude, the planets must have been in the proper alignment last night because I finally got a Bacon Pumpkin Plumpkin in the bathroom of the KFC!

Jim: Woah...thats the rarest of the rare, well done!
by suavedeboner July 2, 2012
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