Abraham Lincoln never kept none of my niggas safe
Only gave them prison dates
And Church's Chicken dinner plate's

from Vince Staples – Trigga Witta Heart Lyrics on Rap Genius

Meaning

He is saying that yes, even though Abraham Lincoln freed the African American slaves, but laws were not put into place for the discrimination that would take place later on in history (Jim Crow Laws).

The irony is, that Lincoln freed the slaves, but African Americans are still receiving prison dates and getting locked up in prison, like they were slaves.

Vince also jokes about how the use of an Abraham Lincoln (five dollar bill) is used for food.

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