"shana" meaning?
I noticed that many of the Indians use the word "Shana" What does this word mean?

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shaana means clever, shrewd generally used in sense of being cunning.

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Shana is actually a slang term, which means a 'wise guy' the more correct term as correctly pointed out by @lordgaurav would be sayana (male) or sayani (female).

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"sana"or "shana"". please write in hindi or urdu,so that i can explain you.

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syana or shana means clever {stress on h}
syana is used for a good feedback whereas shana is used for loose talk
Syana for Masculine****************    Shana/Shaney for Masculine 
Syani for Feminine******************    Shaani for Feminine

Examples-
eh shaney, kya kar raha hai tu?

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