It's the ice man Paul Wall

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

Meaning

Paul Wall popularized diamond (ice) studded dental fronts. He has an association with Houston jeweler TV Johnny Dang which has lead to Dang being the provider of massive diamond encrusted creations to rappers from Rick Ross to Wocka Flocka Flame

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