Madonna apologises for racial slur :

On Friday night, she posted a picture of her 13-year-old son Rocco boxing and used a hashtag that contained a variation of the n-word.["disnigga"]

When fans objected, she defiantly called them haters, but in a statement on Saturday she was contrite, saying: "Forgive me."

Madonna said she was not a racist and she did not mean to use the word as a slur but knew there was no way to defend its use. She said she used it as a term of endearment.

She said she apologised if it gave the wrong impression.

Besides Rocco, Madonna has three other children, including two black children adopted from the African nation Malawi.

Source.

I gather  that "disnigga" is a boastful expression mostly used by blacks.  A translation into formal English would be "This clever person" or the like.  So it's another case of whites not being allowed to use black language, which is racist.  It was Madonna's critics who were racist.