Simple past tense and past participle of hooray.(verb)
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Use "hoorayed" in a sentence
"In a recent headline, the Times -- which has had numerous intimate relationships with Bush -- hoorayed: "The President Wants to Increase Size ...""
"We hoorayed too; and went at 'em in such a slap-bang go-to-glory way that in a brace of shakes there wasn't a Frenchman, a"
"Next minute she was leaning against a goal-post, trembling with the violence of her effort, while the High School hoorayed itself hoarse in the joy of the hard-won victory."