I was listening to a Tripod song, an Australian comedy band, and they used the 'name' dax ipsa (spelled phonetically). It was obviously some sort of joke, but I have no clue what it actually means? Is this something specific to Australia?
Adding some context from Russell's answer:
Gatesy: I'm Batman.
Gatesy: No, I impersonate Batman, for photos and that, you know.
Scod: I don't really get it. What's your real name?
Gatesy: I can't tell you that. People used to tease me at school.
Scod: Oh, come on.
Gatesy: Okay. It's "Dax Ipsa".
Scod: Do you mind if I call you "Batman"?
Gatesy: Yeah, sure.
Found the song on youtube, and linked to the start of the dialog in question: http://www.youtube.com/watch?v=YrlEWc72LWY&t=2m25s