Cause my blood is colder than an ice box
On 1-3-9 you don't want a block war

from Big L (Ft. Jay Z) – Seven-Minute Freestyle Lyrics on Rap Genius

Meaning

West 139th St & Lenox Ave was where he grew up and the title of one of his posthumous albums.

These lines also tie in and plays with each other L speaks of “Ice” but mentions not wanting a block War after stating where he was from (ice block).

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