Swoosh, and that's the sound of a baller
This line is a comparison between what Swoosh sounds like to an African American slave on a ship as they approach the American border in the previous line, and what Swoosh sounds like to a successful African American today.
Swoosh, which is an onomatopoeia, is the sound made by a basketball going through a basket when the ball hits nothing but net. A baller, can be a basketball player or someone from the hood that “made it”, just like Jay-Z.
Also, “Swoosh” is the name for the trademark nike logo is also associated with basketball players (ballers).
There’s the “sound of a baller” in reference to his newly founded Roc Nation Sports in which he just got clearance to officially represent NBA players.
The theme of war/power/enslavement has various levels of depth in this line.
The Swoosh being the Nike logo also links back to the goddess Nike, who was represented on the medal for winning the World War II, but the Project Nike is also a modern U.S. Army military project based on a line-of-sight anti-aircraft missile system. The American military presence is strong today as it was in the past.
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