Open up ya mouth, ya grill gleaming (say what)
Eyes stay low from the chiefing (chiefing)

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

Meaning

While Nelly’s grill gleams brightly, his eyes are dimmed by the weed he’s been smoking.

Similar to a line found in Destiny’s Child song “Soldier:”

“They keep that beat that be in the back beatin'
Eyes be so low from that chiefin'”

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