True in the game, as long as blood is blue in my veins
I pour my Heineken brew to my deceased crew on memory lane

from Nas – Memory Lane (Sittin' in Da Park) Lyrics on Rap Genius

Meaning

De-oxygenated blood running through the body appears blue when we look at it in our veins, so Nas is saying he will forever remain true to his hood roots, and toast those he’s lost.

In addition,“blue blood” typically connotes royal lineage. Nas implies he is a hood aristocrat.

Pouring a drink out is also a common tribute to deceased friends, and Heineken is well known to be Nas’s favourite drink.

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