With my gun in the lap and my bullet in stairs
This is a deep metaphor that Lil B wants you to think about. He’s sitting on top with his gun in his lap and his bullet is on (or somehow in) the stairs. Perhaps Lil B had to metaphorically (or literally) shoot somebody that was on the metaphorical stairs to the top with him in order to reach the top? Perhaps the bullet is now on (or in) the stairs because he shot something with it? Very deep, Lil B. Very deep.
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