Double D, also known as DD is the Designated Driver, or person who can't drink because he has to drive their shit-faced friends home. Often times the Double D shift is rotated amongst a group of friends or a group of friends finds a person desperate for friendship to be the double d.
"Want a beer?"
"Nah man I can't, I'm playing Double D tonight."
by Tony3559 April 3, 2008
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guy whos name and surname begins with d
there is double d sitting on a sack.
by double d March 25, 2005
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A double black diamond run for skiing or snowboarding. It is short for "Double Diamond"
Dude! I just bombed that double d!
by E Z April 29, 2006
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A) The infamous logo of the kids' TV show Double Dare, in which the first letters of the words "Double" and "Dare" are linked together. Also called the "Dueling D's" when early cartoons showed the animated letters throwing pies and spraying seltzer at each other.

B) The large, white circle in the center of the "Double Dare" stage floor, which featured the above-mentioned logo printed in the middle. Often used as a marker during the show's physical challenges.
A) "What color were the Double D's in the 1989 season?"

B) "You can go anywhere on the stage that you want as long as your toes don't touch the Double D's."
by CJ the DJ May 28, 2007
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dirty draws (when a girl or guy doesn't wash their draws)
damn yo....that girl got some double d's!
or: Damn she wore those double d's for like a year!!!
by mookie dookie lalala July 12, 2005
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