Unerzogen literally translates to "uneducated" or "ill-bred," but in the context of children, it means "naughty" or "undisciplined."
In Rammstein's "Angst," the word sets the stage for the song's theme of fear and control, as it's used in the line "Wenn die Kinder unerzogen" (When the children are naughty/undisciplined). This immediately evokes the idea of parental threats and the instilled fear of the "black man" coming to get disobedient children, making it a key word for understanding the song's narrative.
Rammstein's song "Angst," which means "Fear" in German, explores how childhood fears can grow into widespread societal panic. The lyrics begin by describing a common German bogeyman story, where a father threatens his misbehaving children with the "Schwarzer Mann" (Black Man) who will come and get them if they don't obey. This figure is part of a traditional children's game, but the song gives it a much darker meaning.
This early lesson in fear doesn't stay in childhood. The song shows how this belief persists, causing the whole country and its people to live in anxiety. The fear of this undefined "evil" grows, leading people to guard their doors and suffer from physical symptoms of terror like sweaty backs and clammy hands. The lyrics suggest this fear turns into a dangerous paranoia, warning to "trust no stranger" and escalating until a "heavily armed" mob is "screaming fire in the alleys." The song uses this powerful metaphor to critique how fear can be used to control people and lead to widespread delusion and violence.