Slang?
I think '닝꾸' is a korean slang but I'm not sure about it. My first thought was when I saw it, it means something like "xoxo" in English. or Am I wrong?

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I honestly never heard of that word.. 닝꾸.. 0.0;;
But I found that some people say "닝꾸" instead of "링크"(link) just to say it in a cute way.
This slang is not recommended to use... Please don't. It just sounds too weird and not common at all.