usually said when you already knew what one person is talking about or totally obvious. also said in place of "duh!", "no shit!", "really (note the sarcasim)?" or "well, no kidding!"
person: "did you know that 1+1=2?"
me:"der!"
by like, dude! May 30, 2003
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Stupid-ass way of saying dee-dee-dee.
My retarded friend Brittany called me a der-der-der!
by Alex Head June 3, 2006
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Phrase used after something completely obvious is stated, usually to provoke someone.
Gary: "Did you guys know that the Alphabet Song and Twinkle, Twinkle Little Star have the same tune?!"

Stef: "Derp der on the der der!"

DJ: "Gary, sometimes I wonder why I hang out with you."
by deejinator27 May 14, 2013
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the word when someone says something obvious
that chicks hot, well der!!
by Steve-O April 24, 2003
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scandinavian. short for the name Anders.

also the best guy ever. <3 end of story
by kickasskoalax3 August 27, 2008
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Used to simplify such expressions as:
"No Shit!"
"Whatever!"
"Really?!"
Der, I think I know how to be bling-blingin'it up!
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a messed up way of saying "there boy", which is thought to be a saying from the east coast of Canada, but has not been proven as of yet.
person one: Hey man whats up?
person two: O hey der by! just raking some seaweed, you?
person one: what in the hell did you just say?
by seaweed man February 26, 2011
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