To call or shout something in a very loud, guttural, and prolonged cry. A noun or pronoun can be used between "roar" and "out." The crowd of protestors began roaring out demands for the political prisoner to be set free. The frustrated teacher roared the answer out with anger that the students all withdrew into stunned silence.
roar something out
to bellow something out loudly. Walter roared his protest out so everyone knew how he felt. Jane roared out her criticism.