Ja-Wow!
A silly, loud, and totally unnecessary cry you make when something is either so awesome or so terrible it makes you want to scream.
Ja-Wow! My teacher gave me a B+ and I was so mad I threw my pencil.
Ja-Wow! I saw a chicken wearing sunglasses and it was cool.
Ja-Wow! My brother tried to do a magic trick and it was so bad it was funny.