What is Bunga Bunga?

[Catillina]

News say that Berlusconi played "Bunga Bunga" with a 17 year old girl.
I read an explanation that Bunga Bunga is an allusion to an assrape joke, but I'm not sure...

[Raúl Duke]

An Italian newspaper describe it as some sort of reference to an alleged "erotic group ritual," supposedly some sort of mock anal sex ritual that Berlusconi does (according to his opposition? IDK). The word is allegedly derived by a song (and a..joke).

http://www.ilgiornale.it/interni/che_cose_bunga-bunga_nuovo_tormentone_politica_italiana/29-10-2010/articolo-id=483435-page=0-comments=1

http://www.allfunnypictures.com/jokes/Adult_Jokes/Detailed/294.html

http://www.ilsalvagente.it/Sezione.jsp?idSezione=8609

[Sasha]

Apparently its the name for erotic themed private partys burlusconi throws...

[4 Leaf Clover]

actually the last line would go

"and all the tribe cheered in joy "unga bunga till death!"