The KiaSA Guide to the Star Wars Galaxy has this to say on the subject of Nar Shaddaa:

When introducing oneself to high ranking members of the Hutt Cartel stationed on the sprawling black market city-planet, it is strongly advised that one not break out into a song version of Nar Shaddaa Shaddaa to the tune of the Mah Nà Mah Nà song. This is considered bad form among all indigenous life forms of the planet, and is generally punishable by the unfortunate hitchhiker being thrown to a sarlaac.

Or worse still, being forced to sing the song again.