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]