UFC Fighter Suspended For Bloody Spit Attack (Video)

You can punch, kick, choke and slam ... but you CAN'T SPIT ON YOUR OPPONENT during a UFC fight ... something Caio Magalhaes learned the hard way.

The UFC middleweight fighter was just hit with a 6 month suspension for spitting a mouthful of blood at Josh Samman at the end of their fight at "The Ultimate Fighter 21" back in July.

Caio had just been choked out, ending the match -- but when Samman came over to shake hands, Caio brushed him off with a mouthful of bloody spit.

Caio later apologized -- but the Nevada State Athletic Commission decided his contrition wasn't enough and slapped him with a 6 month suspension and ordered him to do 40 hours of community service.