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 homosexualmale and female versions of the double dumpkin are properly refered to as the double blumpkin and the double cunnilumpkin, respectively.
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 divvydumpkin...