Oh, and of course, everyone knows "ixnay," right? It's practically become a "real" word.
My first exposure to this was in The Lion King, which used this particular word. Hadn't a clue what they were saying and I have to admit that it's still difficult for me to translate this easily - I have to stare at it a long time before I 'get' it. But the context was easy enough to understand, even without a direct translation.
I've heard it used in TV and movies since then, of course, so it wouldn't be new to me.
I don't think it's used very much here in the UK though. At least, not that I've heard. I always just considered it a US thing. I've not experienced its use much outside of the US.
LabRat