But my niggas on the block still assigned to the rocks
Joey explains the guilt he feels in that while he is considering being “signed to the Roc” (Jay-Z’s label) to earn his paycheck, all of his friends are still earning their money by selling drugs, or “rocks”, a slang term for crack-cocaine. His use of the phrase “assigned to the rocks” suggests that his friends are selling drugs despite their better wishes for themselves. Desperation and lack of opportunity have “assigned” them to this fate. .
This is a common play on words used by many a hip-hop artist, especially HOV himself.
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