Favela
Flavela is a term used commonly in Brazil to describe slums -- areas of poor quality housing, often crowded onto the hillsides where sturdy buildings are difficult to build. Accidents, mainly from heavy rainfall, are frequent in such areas. Flavelas are often troubled by drug related crime and gang warfare.
Some rumor has it that common social codes inside of flavelas forbid persons living in a flavela to engage in crime and robbery while inside of their own flavela.