A phrase to show that you have no idea what it is, just like most americans have no idea what greek is. What people say before they look to UrbanDictionary.com
It is when you don't know what a word means and you guess that it is Greek because that most words relate all the way back to Greece.
"Supraventricular Tachyarrhythmias what does that mean?," said my brother. "I have no idea seems Greek to me!," I say. "No seems more Latin to me," said my brother. Then I bowed my head in defeat.