WIKIPEDIA: Bunga Bunga is a phrase of uncertain meaning that dates from 1910 if not earlier.

In an 1852 issue of Hogg's Instructor, it is stated that "bunga bunga" is the name given by local natives to a location near Moreton Bay on the eastern coast of Australia. In 1910 a group of English friends, including Virginia Woolf and her brother Adrian Stephen, pretending to be the Prince of Abyssinia and his entourage obtained permission to visit HMS Dreadnought, then one of the world's most powerful warships, in Weymouth in what became known as the Dreadnought hoax. Each time the Commander showed them a marvel of the ship, they murmured the phrase bunga, bunga! This became a popular catchphrase for a time.

By 2010 the phrase had gained popularity in Italy and the international press as well, when it was used by the Italian Prime Minister Silvio Berlusconi to refer to his alleged sex parties, which caused a major political scandal in Italy.