I'm telling you that setup in them sit-ups is so sad
The system is a slab,

from Lupe Fiasco (Ft. Casey Benjamin) – Strange Fruition Lyrics on Rap Genius

Meaning

Continuing the stomach imagery, the system’s set up (homonym on sit up) is so loose and poorly put together, that if the streets are the belly of the beast, then the system looks looks like this:

The use of “slab” here, Southern rap slang for a Slow, Low, And Banging car, sets up the lingo in the next few bars

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