It's a recent slang in korea. It's used to describe something petty and selfish or mean.
(It was created by the infamous event in korea called Minhijean gate)
A: I think I'm the best singers and all the other singers in our company believe in some stupid cult or trying to be me.
B: Wow.. please.. that's so newjeansrupda..
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A new slang used in Korean nowadays: Newjean srup da 뉴진스럽다
: Meaning something is petty and selfish or petty
A: I'll use youtube for the tean project.
B: Nope. You can't. Only I'm going to use it!
A: Ho that's Newjeansrupda
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