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Three-time world boxing champ Adrien Broner fiercely attacked Jay Z for what he says is a highly insulting offer to join Roc Nation Sports.

Adrien just appeared on "TMZ Hollywood Sports" and skewered the hop-hop mogul/sports titan for offering him a paltry $40 mil for 5 years. Adrien reaffirmed his directive that Jay could "suck my ****."

Going after Jay Z takes balls, but he got even ballsier when he went after another Roc Nation client, Rihanna, whom he says could go f herself, adding the only thing she's good for is p****.