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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
24 2
Pronounced "why"

Spanish slang for cool.
El show de la noche pasada fue super mega guai.
by VickyT February 03, 2008
3 6