Got 30 down at the bottom, 30 more at the top

from Nelly (Ft. Ali, Brandi, Gipp, Jermaine Dupri & Paul Wall) – Grillz Lyrics on Rap Genius

Meaning

Probably referencing the value of the top and bottom parts of his grill, $30,000 each. Also possibly saying that he has 30 diamonds in each part of his grill.

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