You are sad, so you scream "NUUUUUUU!"
Kitty! Kitty die! NUUUUUUUUU!
When somebody you love does or says something that's beyond cute
"Klárka is so nuuu."
The sound someone makes when they have lost an argument or are falling off a cliff. May also be used in sarcasm.
Person 1: You just lost. Person 2: Nuuu damn.
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