Gonna tell you guys what they were screaming:
Right after Buffer's "its time!" they are singing a famous song here in Brazil, during Paulo Thiago's fight, The song's name is "Tropa de Elite", refering to the special police force Paulo Thiago works, ot goes something like this in English: "Elite troop, hard bone to chew, they get one, they get them all, they also gonna get YOU!"
After that they scream "Caveira! Caveira" wich means "Skull", and it is Thiago's Police Special Force symbol.
"O Rodrig„o voltou!" After Minotauro's win "Rodrigo is back!".
While AS tools Okami, they were shouting "Uh! Vai morrer! Uh! Vai morrer!" wich mean "You are going to die!"
After the win they shout "… Campe„o!" wich means "You're the champion".