It's a great day for genocide (What's that?)
That's the day all the niggas died

from Ice Cube – When Will They Shoot? Lyrics on Rap Genius

Meaning

When the riots ended, the U.S. brought in pretty much EVERYTHING to kill or end the riots.

Black people died. A lot of them.

To help improve the meaning of these lyrics, visit "When Will They Shoot?" by Ice Cube Lyrics and leave a comment on the lyrics box