It's slang for what the drug dealers from Rio de Janeiro do with the police informants (or X9) and his enemies. They put a person into a pile of tires, they throw some kind of fuel, and then they set fire on you.
As you must know; it is a horrible way to die!
Traficante: "Seu X9 filho da puta, tu vai pular no microondas!"
Drug Dealer: "You mother fucker police informant, you'll die burning in fire!"
It's a way that many Brazilians use to call the american football or football as it called in the USA. It can be translated as "footfag". Most of us think it is a gay thing, and they also think it supposed to be called handball, because the football players rarely use their feet.
Homem 1: "Bando de viados, isso é só uma desculpa para os viados se agarrarem! Essa merda devia se chamar futebicha americano."
Homem 2: "Concordo, essa merda é coisa de viado!"
Guy 1: "Bunch of fags; that's just an excuse for fags grab each other! This shit supposed to be called footfag."
Guy 2: "I agree; this fucking shit is such a gay thing!"