The sound produced when someone or something bellows(noun)
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Use "bellowing" in a sentence
"In the near future we may finally get that movie featuring a beer-quaffing Van Rjin bellowing Falkayn, Adzel, and Chee Lan to another adventure aboard the Muddlin 'Through."
"Would you call the bellowing disruptors Unamerican?"
"Hype is already at fever pitch over Terminator Salvation, having been drummed up by a fairly impressive trailer and that tape of the angriest man in all the word bellowing “AH DA DA DA DA!” at a subordinate."