udk
Common short way of saying, YOU DON'T KNOW!! Often followed by, "Nope, nope you don't."
Rakhi: What's up your butthole?
Aaron: Dude, idk.
Rakhi: DUDE, UDK.
Aaron: W00ts your butthole.
Rakhi: I guess
Aaron: Duh.
by Donosaur's Mommie August 04, 2006
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