Truth telling while you niggas still stuck
Under the pavement, still stuck on them slave ships

from The Underachievers – So Devilish Lyrics on Rap Genius

Meaning

Clever wordplay. Issa has freed his mind and is spitting truth while you are on the slave ship, trapped in chains and also going to spiritual and literal death (hell if you will). Spiritual as the slave ship is taking you off in chains. Literal because slave ships took slaves to America where they were worked to death.

Issa is also a loose Progressive Era affiliate so possibly this is a nod to “Like Water”

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