What means "marfă" in Romanian?
Hope you can explain me the meaning of this word. Thank you!

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Este hazliu! Acest cuvant este in uz in capitala Romaniei pentru a defini ceva foarte frumos. Sau ceva surprinzator. 
Antonim: Naspa

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The main meaning of  "marfă" is "merchandise" :   Vaporul transportă marfă =  the ship transports merchandise/goods .

Alternatively, in slang it means "cool" .

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* marfă ( jargon of young people) = good; nice; qualit; 
Example: ◊ Mi-am cumparat niște blugi marfă.  ( I bought some quality jeans. )

*marfă (noun) = cargo