Getting a blowjob from someone who is taking a dump and the same time while you are eating a donut.
Dude - I had the most wonderful Dumpkin Donut this morning. The old lady blew me while she was taking a dump and I was eating a donut at the same time.
Simultaneous oral sex performed by a male and female in the 69 postition, while both parters also defecate. This is a rare combination of the blumpkin and the cunnilumpkin.
Note: The homosexual male and female versions of the double dumpkin are properly refered to as the double blumpkin and the double cunnilumpkin, respectively.
Hey baby, I need to drop a duece too - lets do a double dumpkin!
Childish Lancastrian insult denoting an acute lack of intelligence. Believed to originate from a portmanteau of the names of famous newcaster David Dimbleby and Trumpkin, from 80s fantasy film Labyrinth.
Person 1: You know, I kinda believe what that Jeffrey Archer guy's saying...
Person 2: Jesus, you're such a divvy dumpkin...