why the numa numa?

let's say I find the whole story very intriguing and I feel I have the background and the personal interest to try to figure this out ( I'm a native Romanian speaker and I grew up in Romania during Communism -- this last bit may be more important than it first appears: Dan wrote the numa numa song and the other O-zone songs in an attempt to break into the Romanian market (he is a native of the Republic of Moldova, which is a historic province of Old Romania called Basarabia that ended-up being part of the USSR, so he spoke Russian and Romanian)