I’m a real OG cause back in nine-three
Niggas couldn’t fuck with me
Sipping 'gnac since I was little

from Nas – A Queens Story Lyrics 1 on Rap Genius

“‘Gnac” is slang for Cognac which is a variety type of Brandy.

Nas is also saying back in 1993 he was too G (gangsta) and cool for anyone to want any problems with him.

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