The Collaborative International Dictionary of English v.0.48:

Cully \Cul"ly\ (k?l"l?), n.; pl. Cullies (-l?z). [Abbrev. fr.
   cullion.]
   A person easily deceived, tricked, or imposed on; a mean
   dupe; a gull.
   [1913 Webster]

         I have learned that . . . I am not the first cully whom
         she has passed upon for a countess.      --Addison.
   [1913 Webster]