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A sound similar to a plush or dog-toy being deflated. Often made by as a vocalization that accompanies a sigh.

The act of making the a sound similar to a deflating plush or dog-toy.
The thing flopped over the armrest with a tired kyuu.

As the door opened, it lifted its head and kyuued curiously towards the direction of the sound.
by Lochi Tandoku December 26, 2017
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It is often used to describe how cute the thing is to the point where you just want to kill/destroy/annihilate it.

Also used to describe someone whom you just want them to simply blow up.
Come back! I just want to kyuu you!
by Kyuu-dachi August 31, 2015
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A stupid faggot (Pronounced FAE-got) who...
- Gets 3-stocked by Slug in Brawl
- Has a cousin who is quite adept at smashing the C-Stick
- Kills Deviling and gets a Blade of Darkness
- Gets 3 Smokie Cards without getting a Kitty Band.
- Gets dropped by Garm and loses MVP
- Forgets to bring his ED to Phreeoni
Ralph: Yeah, I was playing this game called Ragnarok Online, and I killed this purple jell-O thing and it gave me some sort of sword, but I can't equip it.

Samwise: Lolocaust, you're a total Kyuu.
by Slug>Kyuu September 19, 2008
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