yoo–hoo

interjection \ˈyü-(ˌ)hü\

—used to attract someone's attention or to call out to someone

Full Definition of YOO-HOO

—used to attract attention or as a call to persons

See yoo–hoo defined for English-language learners

probably alteration of yo-ho, interjection used to attract attention — more at yahoo

First Known Use: circa 1924

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