The Collaborative International Dictionary of English v.0.48:

Halloo \Hal*loo"\, v. i. [imp. & p. p. Hallooed (-l[=oo]d");
   p. pr. & vb. n. Hallooing.]
   To cry out; to exclaim with a loud voice; to call to a
   person, as by the word halloo.
   [1913 Webster]

         Country folks hallooed and hooted after me. --Sir P.
                                                  Sidney.
   [1913 Webster]