Brandgefährlich is a compound word that literally translates to "fire-dangerous," but it's used to mean "extremely dangerous" or "highly perilous." It's a vivid and intense word that immediately grabs attention.
In the song, Beatrice Egli uses it to describe an intense, almost forbidden love: "Das ist heißer als die Hölle, Brandgefährlich intensiv" (That's hotter than hell, extremely dangerously intense). This word perfectly captures the thrilling and risky nature of the passion she's singing about, making it a memorable and enticing choice.
Beatrice Egli sings about a relationship she keeps ending and keeps going back to. She has walked out a thousand times, "Ich hab' schon tausendmal Schluss gemacht" (I've already broken up a thousand times), but "Doch komm' nicht los von dir" (But I can't let go of you). They meet again at night, and then he leaves.
The chorus names the trap: it feels "verboten gut" (sinfully good), "heißer als die Hölle" (hotter than hell), and the feeling is "wie ein Vulkan / Den man nicht löschen kann" (like a volcano that can't be put out). The line "Ich will was ich nicht will" (I want what I don't want) says it plainest. This live version folds in the Italian hit "Bello e impossibile", whose lines about a love that is beautiful, impossible and never enough say the same thing in a second language.