When some 1, man or non man has wronged some 1 else or made a mistake. You would be saying this to a friend or some1 who isn't the person who got caught in the act.
Cyril: "yo glenster yh, u heard bout my man JJ yh, he got dumped by another gold digger, he ran outta p's"
Glenny: *BEEP* *BOP*, "H.i.s.......b.a.ddd", *BEEP*
Cyril: "ofc ofc, it is his bad"
James Brown. One of his many nicknames, this is taken from his 1968 song "Say It Loud (I'm Black and I'm Proud!)".
Let's all give a warm welcome to the Godfather of Soul, his bad self, Mr. James Brown!