Simple past tense and past participle of moo.(verb)
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Use "mooed" in a sentence
"So Peter -- he being engaged at the time and consequent in that condition where he'd have put on horns and "mooed" if she'd give the order -- he thought 'twould be nice, too, and for a week it was "all hands on deck!" getting ready for the "house-party.""
"Just then two birds flew by, close together and perfect mates; and the cows raised their heads and "mooed" at the same time; and two men -- also twins -- came over the two hills along the two paths with two dinner-pails in their hands and entered the two houses."
"And when they were a safe distance they both stopped, looked over their right shoulders, and "mooed" at the same instant."