The dregs from a rum barrel.
"I got sloshed from drinking the dunder." Hince the phrase, "He's a dunderhead."
door Mark Dunder 4 augustus 2003

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Top Definition
An alias for double underscore, "__". Specially useful in the Python computer language, in which names like "__init__" are common. Coined as a speech shorthand.
Eric: So the problem is initdata? (the method initdata() )
John: Nope, dunder init dunder is where things start to go wrong... (__init__)
door ajaksu 22 mei 2006

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Dunder is a combination of the words dirty underwear.
"make sure to wash your dunders" "Dunderwear, clothes for the working man" "Dunderwear soft enoughf for a mans buttox, toughf enough to handle the swamp ass of a working man"
door Heyballookey2 22 oktober 2008

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A person who is utterly useless and incoherent. The IQ of this person almost always matches, or is close to, that of an average person's shoe size.
Dunder was unable to click the cube because his bandage was in the way.
door DDunder 28 juni 2007

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Polite word for fart.
What that a dunder, Geoffery?
door Its Calum! 26 mei 2008

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Another word for drunk, or just really intoxicated.
Damn, i'm gonna be so dunder after this beer bong.
door Chase 3 augustus 2003

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