Boxing Champ Adrien Broner -- Rejects Roc Nation ... F Jay Z & Rihanna

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****.

Adrien has a lot more where that came from. Check it out tonight on TMZ Hollywood Sports at 6 PM ET, 3 PM PT on Reelz Channel.