NELLY'S MANAGER CLAIMS HE'S ADDICTED TO STEROIDS . .. COCAINE . . . AND GAMBLING!!!

just got some EXPLOSIVE NEWS. According to rapper Nelly's ex-manager - NELLY IS BROKE. The manager claims that Nelly has a VERY BAD gambling problem . . . and that he blew ALL HIS MONEY.

It all started a few days ago when Nelly and his then manager SLIM got into a war of words. Apparently Slim booked Nelly to appear at a Basketball game, and Nelly didn't like it.

So Nelly took to Twitter and AIRED OUT Slim . . . then fired him.

Well Slim didn't like all the SLICK TWEETING . . . and proceeded to put ALLLL of Nelly's business out there.

Dayummm . . . remind us NEVER to get on Slim's bad side. When that man GOES IN . . . he goes ALL THE WAY IN!!