A.J. McKee Says He's Gonna F*** Up 'Pitbull,' Buy House & Porsche W/ Mil Prize Money

🚨🚨 MAJOR BEEF ALERT 🚨🚨 A.J. McKee and Patricio Pitbull -- Bellator Featherweight Grand Prix finalists -- do NOT like each other, and it all goes back to ... an autograph?! "I actually asked [Pitbull] to sign a newspaper," A.J. tells TMZ…