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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!
Guai by r4wr89 July 1, 2011
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From the Chinese, 乖, meaning very well-behaved, good.
"Your children are very guai! Not like those brats over there."
Guai by wuzhu February 1, 2018
Related Words
A synonym for cigarettes used by teenagers in South Africa 🇿🇦
Sjo bru, lets go slat a guai before class?
Guai by Miancpt July 15, 2020
Slang for cigarettes in South Africa
Sho Bru let's go slat a guai quick.
Guai by Jirrrbru July 15, 2020
Meaning cigarettes in south africa. Another word for ent.
Bra let's go smoke this guai my hands are shaking.
Guai by Jirrrbru July 15, 2020
El show de la noche pasada fue super mega guai.
Guai by VickyT February 3, 2008

Guai lan 

Literally means "Strange penis" in hokkien,

means someone who is very hard to deal with
some of the Singaporean damn guai lan
Guai lan by Lim pei October 28, 2009
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British slang for a scientist or technical expert, esp . when the speaker is not certain of the expert’s specific field of study. Not necessarily derogatory, but typically used by persons without a technical background. In the US, the equivalent would be “egghead”, “squint”, or “geek.”

Origin of the word is unknown. Started sometime in World War 2. Given the typical evolution of British slang, could easily have started because what these experts did was confusing or “baffling” to the common person.
According to the boffins downstairs, the murderer used a serrated blade.
Boffin by Agnon February 11, 2023
Word of the Day on October 3, 2026
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