Oitão is Brazilian Portuguese slang for a .38 caliber revolver, named after the figure eight its grip and cylinder trace. It is a stark, street level word, heavy with the weight of real danger rather than a neutral term for a firearm.
In the song, Racionais MC's sing "Quem tem vida decente não precisa usar oitão" ("Those who have a decent life don't need to use eights"), using the word to tie owning a gun to a life with few other options.
Racionais MC's really hit hard with "Otus 500," taking a critical look at 500 years of Brazilian history and social inequality. The song kicks off by repeating "500 anos tudo igual" [500 years, everything the same], emphasizing how little has changed in terms of justice and peace.
It paints a stark picture of Brazil as a "vergonha" [a shame], where "polícia fuma pedra moleque fuma maconha" [police smoke crack, kids smoke weed]. The lyrics then shift to the growing frustration of those living in poverty, who are tired of being "ingênuo humilde e pacato" [naive, humble, and peaceful]. They're ready to take what they feel is owed to them, turning from "caça" [prey] to "predador" [predator]. The song even imagines them taking over the wealthy's lives, wanting "piscina digna de um patrão" [a pool worthy of a boss] and all the luxuries they see others flaunting. It's a blunt and powerful commentary on social class and the desire for a better life.