Like a G I hold it down for the town I’m at

from T.I. – I'm Back Lyrics on Rap Genius

Meaning

T.I. “holds it down” (reigns supreme) in Atlanta like a G (short for “gangster”)

Of course, G is also short for “Gucci” — T.I. could be saying that he, like Gucci Mane, holds it down for Atlanta

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