Fat Joe is a big man.

So he needs a big watch.

Joe stunted his new timepiece, the Avalance, which he claims costs $4 million.

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"Don't do this to yourself guys, $4 mill to the wrist  It come with a 24-hour security.  You don't want this type of smoke right here.  This is what I call pushing P," Joe said, and then flexed the GIA certifications for all the diamonds on the watch ... "The Avalance, step your game up."

Do you think that's worth $4 million?  Or is Joe about to get Fake Watch Busted?