Source : Webster's Revised Unabridged Dictionary (1913)

Yaup \Yaup\, v. i. [See {Yap}, and {Yelp}.]
   To cry out like a child; to yelp. [Scot. & Colloq. U. S.]
   [Written also {yawp}.]

Yaup \Yaup\, n. [Written also yawp.]
   1. A cry of distress, rage, or the like, as the cry of a
      sickly bird, or of a child in pain. [Scot. & Colloq. U.
      S.]

   2. (Zo["o]l.) The blue titmouse. [Prov. Eng.]