Top Definition
A better, more correct version of 'dunda head.' Dunder brain can be used as a friendly insult, but do not try actually paying somebody out with this word, because you will seem like a complete moron, and a 'dunder brain' yourself.

Can refer to someone who is muddled in the brain, or a generally silly person.
Kayla: "You're a dunda head"
Me: "No, Kayla, it's dunder brain"
Kayla: "You're a retard"
by bucranogus September 16, 2010

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