Angel on my back everywhere I'm at
Niggas don't believe it just when I lay it down
And when I get back up and see my angel on the ground..

from Lupe Fiasco – Super Cold Lyrics on Rap Genius

Meaning

He lays it down on the track and the people don’t believe the quality of the stuff he drops.

When Lupe lays down, because there’s an angel on his back, when he gets up it remains on the floor, like a snow angel.

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