Nobody stepped in to ever slow 'em up, gasp

from Lupe Fiasco – Bitch Bad Lyrics on Rap Genius

Meaning

A clever car metaphor: “nobody stepped in to ever slow ‘em up”(as in, stepping on the brake). These kids don’t have mentors/role models to help these kids grow up “properly”. Instead, they are only influenced by their environment which encourages them to grew up fast (see previous line).

…“Fast” like you’re stepping on the “GASp” (Lupe says “gasp” like “gas” but with a p")

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