Désarticule means to 'dislocate' or 'dismember'. It's a striking and somewhat unsettling word, especially when applied to a doll.
In the song, the narrator sings, "Et je désarticule le pauvre pantin" (And I dismember the poor puppet). This word is particularly interesting because it evokes a strong, almost violent image, contrasting with the seemingly innocent subject of a doll. It hints at a deeper, perhaps darker, subtext in the song about control and destruction, making it memorable and thought-provoking.
Gainsbourg turns a child's toy into a small, unsettling joke. The doll of the title "fait pipi, caca" [pees, poops] and says "papa" — sung flat, like a nursery rhyme that has gone sideways. He inventories her in doll-shop detail: tiny white socks, "une culotte à trous-trous" [some holey panties], a little chain around her neck. Then the mood turns rougher — "Faut la rattraper par la manche" [you gotta grab her by the sleeve] before she tips backward, eyes wide open, legs in the air — and by the closing verses she is something to be handled carelessly and finally pulled apart: "Je désarticule le pauvre pantin" [I pull apart the poor puppet], the narrator insisting in that same flat voice that he is being careful not to make her cry. The plain, sing-song melody carrying it all is the joke.