DuckCorp Dico

Found one definition

1.                 From The Collaborative International Dictionary of English v.0.48:
                   
   
   
                   
                     
   Flaky \Flak"y\, a.
      1. Consisting of flakes or of small, loose masses; lying, or
         cleaving off, in flakes or layers; flakelike.
         [1913 Webster]
               What showers of mortal hail, what flaky fires!
                                                     --Watts.
         [1913 Webster]
               A flaky weight of winter's purest snows.
                                                     --Wordsworth.
         [1913 Webster]
      2. prone to strange or erratic behavior; -- of persons.
         [PJC]
      3. odd, unpredictable or unconventional; offbeat; whacky; --
         of behavior.
         [PJC]
      4. unpredictable, erratic, or unreliable; -- of machinery,
         especially electronic devices. "a flaky computer board."
         [PJC]