Meaning: It was unintelligible to me.
Origin: From Shakespeare`s Julius Caesar, 1601:
Did Cicero say any thing?
Ay, he spoke Greek.
To what effect?
Nay, an I tell you that, Ill ne'er look you i' the face again: but those that understood him
smiled at one another and shook their heads; but, for mine own part, it was Greek to me.
I could tell you more news too: Marullus and Flavius, for pulling scarfs off
Caesar's images, are put to silence. Fare you well. There was more foolery yet, if I could remember it.