That's Portuguese, it means "More love, less motor".
Car Runs over Critical Mass Cyclists in Brazil
Driver Plows Through Dozens of Cyclists in Brazil
I don't understand how intentionally running down cyclists is self-defense, or how it's supposed to teach anyone anything. A bicycle is a means of transportation for millions (if not billions) of people around the world. There's no way in h*ll drivers, however maniacal, will frighten people off their bikes.
Go Critical Mass!
Until next time, ride long and keep the rubber-side down.