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...
by Nobscratch June 15, 2010

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