Niggas I used to run with is rich or doing years in the hundreds

from Nas (Ft. AZ) – Life's a Bitch Lyrics 1 on Rap Genius

Doing years in the hundreds refers to being sentenced to jail for hundreds of years, presumably for very serious crimes like homicides or large scale drug conspiracy. Getting rich from drug dealing is risky, you either end up rich or end up in prison

This is actually a pretty positive outlook compared to AZ’s (death or prison) — at least some of them did well!

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