Source : Webster's Revised Unabridged Dictionary (1913)

Out-Herod \Out-Her"od\, v. t.
   To surpass (Herod) in violence or wickedness; to exceed in
   any vicious or offensive particular. ``It out-Herods Herod.''
   --Shak.

         Out-Heroding the preposterous fashions of the times.
                                                  --Sir W.
                                                  Scott.

Source : WordNet®

out-herod
     v : surpass someone in cruelty or evil