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1.
le xuan is a highly well known vulgar phrase used in Singapore. Derived from a person who has exceptionally long nose hair, it has two meanings to date:

le xuan-adjective:

used to describe something god-awesomely orgasmic

le xuan-noun:
slang for pubic hair
le xuan-adjective: "Damn! That bag is so le xuan!"

le xuan-noun: "Dude your le xuan is sticking out of your boxers."
by bimao May 10, 2011