Opa is Argentinian slang for "retarded" :-(

Also a greek exclamation common in songs, e.g. http://www.youtube.com/watch?v=bmeCC53FKes

It apparently means Ulcer in "Lithuanian". http://translate.google.com/#lt|en|Opa

Also grandpa in german.

Just in case anybody wonders: roughly half of the Opa team speaks German, at least one speaks Argentinian Spanish, at least one speaks Greek. So, yeah, we are aware of most of the puns.

Guess what? We like them :)

Opa translated from Portuguese to English means wow, or whoops ...

It means "older brother" in Korean.