An exclamation expressing surprise, interest, or delight, usually drawn out to show enthusiasm or amazement.
Onomatopoetic origin, created to represent the sound of wonder, amazement, or anticipation. Not derived from standard word roots but rather from natural human vocalizations, varying in length based on intensity.
This isn't even in most dictionaries as a 'real' word, yet everyone makes this sound and writes it online—it shows how English speakers create and recognize new sounds that dictionaries lag behind in recording!
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