Source : Webster's Revised Unabridged Dictionary (1913)

Augean \Au*ge"an\, a.
   1. (Class. Myth.) Of or pertaining to Augeus, king of Elis,
      whose stable contained 3000 oxen, and had not been cleaned
      for 30 years. Hercules cleansed it in a single day.

   2. Hence: Exceedingly filthy or corrupt.

   {Augean stable} (Fig.), an accumulation of corruption or
      filth almost beyond the power of man to remedy.

Source : WordNet®

Augean
     adj : extremely dirty and corrupt; "every government ought to
           attend to cleaning its own Augean stables"