Could be a race war, niggas on your mark
'Til somebody start

from Wale – Freedom of Speech Lyrics on Rap Genius

Meaning

Race war is a term referring to developing hostilities between Races (ethnic groups) divided on the basis of racial group or skin color.

So he’s saying be ready and watch out, anything can happen between the people

The phrase “on your mark” refers to the fact that, in a foot race, an announcer starts it by saying “on your mark, get set, go!”

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