It's just that Jigga Man, Pimp C, and B-U-N B
The rappers on this song are:
Jay-Z (his bouncy nickname is “Jigga”)
Chad “Pimp C” Butler (R.I.P.), the founder of U.G.K. (Underground Kingz), a Texas-based rap duo
Bernard “Bun B” Freeman, the other half of U.G.K.
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