another word for duh. when someone says something idiotic, and you want to say "duh" in a much more sophisticated way, you should say "derr"
-is your mom hot?
- derr.
by Anonymous January 30, 2003
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A word used to infer the unintelligence of an individual, item or anything else when mocking them
derr I'm kate perry, i think that i have a massive bust
derr I'm legal system, I give criminals rights
by tehleetx0r August 17, 2009
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one who has strength, wisdom, and great physiqueness.
by Haley the Great August 3, 2007
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1/ A sound generally attributed to those with mental afflictions making more articulate use of oral communication impossible.

2/ A sound used to mock said people.
by KNfLrPnKNsT October 24, 2005
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a person who is acting stupid or being a dumbass. You can also use it instead of calling somebody stupid, a dumbass, bitch, etc.
Guy: You're a slut.
Girl: Well you're a derr.

by a pnaii July 20, 2006
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same as duh
i know that your are stupid derr
by Jeremy Garvey January 27, 2004
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pronounced: Duhr, or durr. a "derr" is a person with special needs, or a person who is acting idiotic.
by Justin Martin November 6, 2006
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