Definitions

1. exclamation

an expression of surprise, excitement, or wonder; an interjection expressing admiration or astonishment

“She let out a loud ‘hoo’ as she saw the beautiful sunset.”

2. verb

to cry or scream loudly, especially in excitement or surprise

“The crowd began to hoo with excitement as the concert started.”

3. interjection

used to express surprise, excitement, or enthusiasm

“Hoo! Look at that amazing view!”