Eyes closed, the black is back, out come the 'Lac with flats
“Black is back” is a reference to the ‘Lac (cadillac) in the second half of the line and his eyes being closed. He has a black cadillac and when you close your eyes all you see is black. You could close your eyes if you need to concentrate, and his Caddy is the “outcome” of the concentration and hard work he puts into his art. And when you die people wear all black to your funeral, making this line a threat
Also a play on the phrase “back in black,” popularized by Australian Rock/Metal band AC/DC. Their album of the same name sold 21 million copies in the US and 40+ million worldwide, making it one of the best selling albums in the world.
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