'Burgis' comes from the French word bourgeoisie, referring to those in the middle class and upper class. During Martial Law era, they are known as the ones who stayed on the safe side.

More slang terms and their meanings in the full video: https://www.rappler.com/life-and-style/arts-culture/video-slang-terms-popular-martial-law-edsa-people-power-era/