Whew duck

from The Collaborative International Dictionary of English v.0.48

Whew \Whew\ (hw[=u]), n. & interj.
   A sound like a half-formed whistle, expressing astonishment,
   scorn, or dislike.
   [1913 Webster]

   {Whew duck}, the European widgeon. [Prov. Eng.]
      [1913 Webster]