I already explained that. It was figurative speech referring to armament being able to mimic a black blade since as long as Zoro applies Haki, his blade turns black and gets its property, like becoming hard. "Every weapon can become a black blade" came right after the statement of infusing the blade with Haki.
		
		
	Show me zoro s black blade
Again the drinking shit was about coa not black blades
 
				 
 
		