But most of y'all don't get the picture 'less the flash is on

from Lil Wayne (Ft. Cory Gunz) – 6 Foot 7 Foot Lyrics on Rap Genius

Meaning

“Flash” as in “style”, We don’t understand, or care, about the man behind the mask, i.e., the Dwayne behind the Lil Wayne.
It’s because, as the public, we’re too eager to consume the image of celebrities created by the paparazzi and the media.

Oh and this isn’t just a tip for photographing dark people in dimly lit places, which is that you might as well leave the lens cap on if the flash isn’t working, but that a lot of people, obviously not Rap Geniuses, don’t understand him if he doesn’t enlighten the matter.

This could also mean people don’t get it or take a situation seriously until the gun are drawn (which also causes a flash when shot)

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