They're our seeds and when they bleed, we bleed
That's what becomes of lonely children, they turn to G's

from 2Pac (Ft. Vanessa) – This Ain't Livin Lyrics on Rap Genius

Meaning

That what society does to young black youth, will come back to haunt them.

As he says in this video explaining the backronym for THUG LIFE:

What you feed us as seeds,
Grows and blows up in your face

https://www.youtube.com/watch?v=QCEf557fNYg

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