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Short form for U Dont Even Know. Also pronounced U-DECK to troll people.
Guy #1: UDEK
Guy #2: Wtf man I Deck?
Guy #1: LOL UDEK SO HARD
Guy #2: WTF are u talkin about
Guy #1: UDEK about UDEK
by AnHeroBarrellRoll August 05, 2009
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