Verreckt is a very strong and informal German word, meaning to 'die' or 'perish', often used for animals or in a derogatory way for humans. It's much more impactful than the standard 'sterben'.
In this song, the artist uses it to describe how the constant, bland music on the radio makes people's brains 'die' or 'rot'. It's a provocative choice that highlights the song's rebellious and critical stance against mainstream radio, making it a memorable and attention-grabbing word.
Have you ever been so annoyed with the music on the radio that you just wanted to scream? That's exactly the feeling behind Umbra Et Imago's "Radiosong." The singer is completely fed up with the "greasy," overly polished, and mind-numbing music being played. He dreams of a world filled with real "art and culture," but feels the radio is stubbornly playing the opposite.
For him, the solution is simple: say "'Auf Wiedersehen'" (Goodbye) to the radio. He argues that the sanitized, inoffensive songs on the airwaves are so bad they can even ruin a romantic mood! The singer believes that truly good music, the kind with passion and edge, can only be found in one place: the "underground." It's a powerful call to turn off the mainstream and seek out something more authentic.