that American kids use?

Just watching the Simpsons and they were doing it, not heard it for ages.

You know the "xnay on the upidstay" or whatever the feck it is they say. I jut tried to search google and one came up called called Ubbi Dubbi but I don't think it's quite the same one?! Mayeb it is.
http://pbskids.org/cgi-registry/zoom/ubbidubbi.cgi