Cunnilingue is an adjective derived from the sexual act of cunnilingus. It's a highly unusual and provocative word to find in a song, especially in a mainstream context, making it instantly memorable and intriguing.
In the song, Serge Gainsbourg uses it to describe a "voix cunnilingue" (cunnilingus voice) coming from the control tower. This personifies the voice in a suggestive and explicit way, hinting at the song's playful and often risqué themes, characteristic of Gainsbourg's style. It's a word that immediately grabs attention due to its rarity and explicit nature.
Serge Gainsbourg was a master of the double meaning, and this song is one of his most famous examples. He builds a whole story around a pilot flying a beat-up old plane, an "Avion fantôme hou hou" [ghost plane, ooh ooh]. The pilot's instruments are broken and he's making a risky landing on a "terrain mou" [soft field]. It all seems like a strange adventure story, with the pilot wondering if he's landed among "cannibales" [cannibals].
But as the song goes on, the metaphor becomes very clear! The pilot's cockpit is invaded by a "haleine de peppermint" [peppermint breath] and he hears a "voix cunnilingue" [cunnilingual voice] from the control tower. The whole flight is a very detailed, and very cheeky, description of a sexual encounter. The final line reveals the destination: "Je suis à Marilou" [I am at Marilou's]. It's a classic Gainsbourg track: funny, clever, and definitely not for kids.