You've ever seen a newborn baby kill a grown man
That's an analogy for the way the world make me react

from Kendrick Lamar (Ft. Ab-Soul) – Ab-Souls Outro Lyrics on Rap Genius

Meaning

The world makes Kendrick so mad, that he reacts in such a crazy and unusual way. Hence, the baby killing a grown man; something you don’t see everyday. We’re all born with innocence until the world corrupts us.

For as long as he can remember, Kendrick has been surrounded by violence. It was as if he was fighting to stay alive from the moment of his birth, like a newborn baby that kills grown men. In a sense he’s still a baby when compared to the older men that are in power, but he’s not afraid to challenge them and their ideals.This is also reminiscent of a line in Hol' Up, Kendrick could be referencing himself as this newborn baby.

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