On some young rich shit, Kennedys with black faces
John F. Kennedy was the youngest president that took office; the Kennedy family is also known to be very wealthy. Gambino (being the ripe old age of 28) is saying that he and his clique is getting money like those rich white Fat Cats.
This could also be referencing the line “On deck with a gang of black Kennedies” in Eat Your Vegetables.
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