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Duh means "No shit sherlock" and/or "Thank you captain obvious"
Him: I'm 18
Me: DUH!
Duh by Matt June 17, 2004
Related Words
explained properly by my 3 year old niece to her father.
So the other day Josephine said, "Duh Dad."

I asked her what "Duh" meant and she said that "Duh is when we have an argument and then I say Duh...and then I win the argument."
She's a genius.
Duh by Smile4rhonda June 10, 2010
means "Of course you idiot"
"Did you know he was gay?"
"Duh"
Duh by Alison February 8, 2005
Patently obvious to the most casual observer.

Gergles: I'm getting older.
Sasquatch: Duh. And uglier.

duh by sousi March 11, 2007
An expression that someone says when another person says something obvious or dumb.
Person 1: Hey look I can see myself in the mirror!
Person 2: duh.
Duh by Krazy Boi December 25, 2018
Sound used to imitate a mentally retarded person as an answer to an obvious remark or question. The person using "duh" is thereby sarcastically indicating that he/she is not retarded and the forgoing remark or question is obvious to him/her.
Him: Hey, to insert a column you have to press the column insert menu!
Me: Duh! No kidding!
duh by martaze August 28, 2008