Nelly -- 'MADONNA F*CKED UP' ... By Dropping N-Bomb Online

Madonna straight "f*cked up" when she dropped the N-word online in a shout out to her son ... so says the rapper Nelly, who tells TMZ, "She need to get her sh*t right."

CHECK OUT MADONNA CALLING HER SON THE N-BOMB

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#nelly #madonna #nigga #tmz