Definitions

1. interjection

a long, drawn-out ‘o’ sound, often used to express excitement, surprise, or anticipation

“The crowd’s collective ‘oooo’ filled the stadium as the concert began.”

2. noun

a prolonged ‘o’ sound, especially one used as a form of vocal expression

“The sound of the audience’s oooos echoed through the concert hall.”

3. verb

to make a prolonged ‘o’ sound, often in a state of excitement or anticipation

“The kids were oooing and ahhing over the fireworks display.”