Help with very stupid question

zachdecker thought this was worth mentioning said

Based on experience, this is the kind of really stupid question I think I can get an answer for here.

I remember some TV show or movie, fairly sure it was a comedy, where someone had invented a new country. This may have been a cartoon, but I’m not sure.
A character made up a national anthem to go with the fake country, and they sang it. And at the end of the anthem, it just ended very suddenly with something like “Oh… xxx-nia!”

I can’t remember the name of the fake country though, or what movie or show this was from. I’m just fairly certain the song ended with the country’s name, and that the country name ended with -nia.

I’ve been searching google, and am not having any luck.
Is anyone able to help me with this?