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1.
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"
by Heyballookey2 October 22, 2008
 
2.
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__)
by ajaksu May 22, 2006
 
3.
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.
by DDunder June 28, 2007
 
4.
Polite word for fart.
What that a dunder, Geoffery?
by Its Calum! May 26, 2008
 
5.
The dregs from a rum barrel.
"I got sloshed from drinking the dunder." Hince the phrase, "He's a dunderhead."
by Mark Dunder August 04, 2003
 
6.
Another word for drunk, or just really intoxicated.
Damn, i'm gonna be so dunder after this beer bong.
by Chase August 03, 2003