Holloing

from The Collaborative International Dictionary of English v.0.48

Hollo \Hol"lo\, v. i. [imp. & p. p. {Holloed}; p. pr. & vb. n.
   {Holloing}.] [See {Hollo}, interj., and cf. {Halloo}.]
   To call out or exclaim; to halloo.
   [1913 Webster]