Doudoune is a french word or maybe a Belgium word ( we call some things with others words than the french people)
An doudoune is a big coat that you wear in winter.
But I don't think she want to talk about that because JAVA is a kind of dance.
I write this title on Google and I saw another song. Maybe she covered that song like she did with "Je serais la plus belle pour aller danser" by Sylvie Vartan !!