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Meaning of yoo-hoo

yoo-hoo

Pronunciation: (y'h"), [key]
— interj.
  1. (used as an exclamation to get someone's attention, in calling to another person, or the like.)
—v.i.
  1. to get or attempt to get someone's attention by or as if by calling “yoo-hoo”: yoo-hooing across the back fence.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.