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Pronounced "g-why"; a colloquial Chinese adjective used most often by parents as a statement of their child's good behavior. Also commonly used in English conversation to describe responsible or respectable behavior among friends, or as an informal term for praise.
Me: Dude, I killed that essay. Worked all night without touching Facebook paid off: I got pretty much full score!
Joe: NICE. So guai!
by r4wr89 June 29, 2011
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From the Chinese, δΉ–οΌŒ meaning very well-behaved, good.
"Your children are very guai! Not like those brats over there."
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by wuzhu February 01, 2018
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