"To jump in the microwave oven"
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!"