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"Kuy" in Thai slang word is defined directly as a male's genitals. The word is rude and should only be used with close friends.

The word "Kuy" is often used in conversation as a remark/reply to someone else. Can be compared to the word "fuck you" or "ass".
Scott: Hey man, please don't ever scream, your voice sounds like a girl.
Jason: Kuy...
by Steele... September 06, 2006
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