Out of spite, I just might flood these streets
This is a continuation of the previous lines. He’s saying let him commit a real crime by buying a kilo for Chief Keef and “flooding” the streets by dealing it out at a low price. Using “Chief Keef” plays on the rapper’s drug inspired name and Keef’s recent controversies. Jay may be a businessman, but he never left that life. He raps this line in a sound very similarly to Chief Keef.
Expanding on “flood these streets”: given the topic of government and politicians, a listener can infer government failure in Katrina “flood these streets.” It’s a play on the government flooding New Orleans' streets by not dealing with Katrina, versus Jay giving the government trouble by bringing in cocaine to metaphorically flood the streets.
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