Niggas can't stop my train, I'm Chubb rocking
What's beef? Who ready to die? I'm big popping
I'm hundred proof, you niggas cheap vodka
I'm the lord of the underground, the new chief rocker

from Beanie Sigel – Shot Caller Freestyle Lyrics on Rap Genius

Meaning

Siegel references a gang of great songs and albums here:

Chubb Rock: “Stop That Train”

Biggie (a.k.a. Big Poppa): “What’s Beef?” and the Ready To Die album

Lords of the Underground: “Chief Rocka”

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