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1.
Short for I Dont Know About You...
IDKAY, but this pizza is garbage
by Zantex_w0N June 29, 2011
 
2.
Shorthand for "I don't know" but different from 'idk' in that the k is phonetically spelled.
Person 1: Are you going to the movies?
Person 2: idkay
by UnAnonymous? August 17, 2010