A tiny, almost imperceptible cough, usually hidden behind a mask due to; emphysema, asthma, allergies or the dreaded COVID, so as not to alarm others to your potential of being “the infected.”
I was walking through the grocery store and I had a tickle in my throat but I didn’t want people to think I was contagious so I let out a microcough.
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!"