Two women in Acailandia, Brazil were out Tuesday night when two guys pulled up next to them on a motorcycle and tried to ROB them.

But what the men DIDN’T know is that one of the women was Monique Bastos . . . a professional MMA fighter.

And when she realized they had knives, not guns . . . she ATTACKED them.

One of the guys ran off like a coward, but the other one wasn’t so lucky.  Monique took him down, then choked him out using her LEGS.  Then the cops came and arrested him.

Monique says it wasn’t a huge deal.  Brazil is so lawless, this wasn’t even her first time.  Quote, “I’ve been through this a few times before, and it’s the second time I fought back.”