Fed upon America, we be spittin' it up
Rippin' it up for an even amount in each cup

from Rage Against the Machine – Mic Check Lyrics on Rap Genius

Meaning

Rage Against the Machine’s lyrics are primarily very critical of America’s way of running the government (i.e. Capitalism). And they’re proud to say they make their voices heard clearly (Every single album Rage Against the Machine has ever made has gone platinum.)

What he is saying is that America is of poor quality, or rotten. When you feed upon America or really taken in what is going on you get sick.

he also saying that he wants to rip it up, and get an equal amount in each cup, or use the wealth in the country to make sure that no one is homeless or hungry, that the haves should help the have nots.

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