L'extincteur translates to "the fire extinguisher". It's an unusual and striking word to find at the heart of a song title, especially one by Serge Gainsbourg, known for his provocative and often dark themes.
In the context of "Meurtre À L'extincteur" (Murder with the Fire Extinguisher), the word takes on a sinister and ironic meaning. What is typically a tool for safety becomes a weapon in a fit of jealousy, making it a memorable and intriguing choice that immediately hints at the song's macabre narrative.
The song opens on a pun that the rest of it then takes literally. The narrator wants to put out the fire in Marilou, meaning her appetite and the jealousy it stirs in him, and the thing he picks up to do it with is a fire extinguisher.
One evening he cannot stand the jealousy any longer. He runs into the hotel corridor, lifts the extinguisher off its hook, and swings the cylinder. The blow lands with a "paf" written straight into the lyric.
From there the details are cold and physical rather than emotional. Marilou starts to groan. Blood runs from her split skull, and the narrator notices that its red is the same red as the machine in his hands. She gives one last shudder on the linoleum floor.
Then he presses the lever and the foam covers her body. The device built to put fires out ends up hiding what he has done.
It is a short song, but a dense one. The vocabulary is everyday French put to a very dark use, and the verbs are the part worth slowing down for: eteindre, courir, decrocher, brandir, frapper, appuyer, disparaitre.