DMX TO FIGHT ZIMMERMAN

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Hold off on placing your wagers ... money has become a big snag in George Zimmerman's boxing match against DMX -- the rapper's rep tells TMZ, contract negotiations are STILL ongoing ... so the fight isn't official ... yet.

The rep Domenick Nati tells us, DMX verbally agreed to "beat Zimmerman's ass" ... IF and when he sees the terms of a contract ... which hasn't happened yet. Once an agreement has been finalized, we're told DMX will officially be down for the bout.

As we reported last night, the boxing promoter behind the fight released a statement, announcing DMX would face George Zimmerman in a 3-round match.

Zimmerman plans to donate any money he makes to charity ... but our guess ... DMX won't be so generous.