Niggas is foul and it's duck season
A play on words. Foul as in fowl a.k.a chicken. Niggas is chicken and it’s duck season.
And “Duck Season” is very likely in reference to the classic Bugs Bunny & Daffy Duck cartoons, which invariably end with the fowl getting blasted in the face: http://youtu.be/9-k5J4RxQdE
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