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: Webster's Revised Unabridged Dictionary (1913)