Gangstas move in silence, nigga and I don't talk a lot

from Meek Mill – Intro (Dreams and Nightmares) Lyrics on Rap Genius

Meaning

Gangstas are not known for discussing their personal business because saying the wrong thing can either get the killed or incarcerated for a long time, so they prefer to be brief when conversing. He’s stating that he fits the description and knows how to keep his mouth shut.

This is also a possible reference to Weezy’s line on 6 Foot 7 Foot, which is also an adaptation to a Biggie and BDG line:

Bitch, real Gs move in silence like lasagna

http://twitter.com/#!/questlove/status/14933335868448768

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