And if we cool, then I write a hook for a drop

from DMX (Ft. Jay Z & The LOX) – Blackout Lyrics on Rap Genius

Meaning

He’s saying if he’s cool with the artist, he’ll write the chorus of the song in exchange for an automobile (Preferably a convertible or drop top). This shows just how much his lyrical/ghost writing skills are worth, even his friends have to pay him a ton to write for them.

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