To all my hustlers, rock smugglers, strugglers
Block bubblers, pushers

from J.R. Writer (Ft. Cam'ron & Lil Wayne) – Bird Call Lyrics on Rap Genius

Meaning

“Hustler”, “rock smuggler” and “pusher” all mean drug dealer

“Struggler and "block-bubbler” mean crackhead (since when you smoke crack rock it bubbles…)

JR is rapping for everybody — the dealers and the addicts

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