Source : Webster's Revised Unabridged Dictionary (1913)

Whoop \Whoop\, v. i. [imp. & p. p. {Whooped}; p. pr. & vb. n.
   {Whooping}.] [OE. houpen. See {Hoop}, v. i.]
   1. To utter a whoop, or loud cry, as eagerness, enthusiasm,
      or enjoyment; to cry out; to shout; to halloo; to utter a
      war whoop; to hoot, as an owl.

            Each whooping with a merry shout.     --Wordsworth.

            When naught was heard but now and then the howl Of
            some vile cur, or whooping of the owl. --W. Browne.

   2. To cough or breathe with a sonorous inspiration, as in
      whooping cough.