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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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6
German for "the". Sounds like "duh", or "dah", so this would explain why "der" is used as "duh" in this day and age. Or maybe because it sounds funnier.
"Der launch the missile!"

"*spinning a cat around in one hand*Deeerrrrr hi I'm Rob I'm the biggest idiot in the whole wide world!"
by Dave January 08, 2005
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