When "stupid motherfucker" just isn't enough. A person of unlimited stupidity.
Linkin Park is not metal, you fucking asshole. God, you're such a dunderfuck.
by Ken April 19, 2003
1 more definition
a royal fuck-up. one whom could not possibly fuck up a situation any more.
George W. Bush is one of the biggest dunderfucks to end up running a country.
by Volak April 28, 2004