Greek to

Greek to (someone)

incomprehensible to someone; as mysterious as Greek writing. I don't understand this. It's all Greek to me. She said it was Greek to her, and that it made no sense at all.
See also: Greek
References in classic literature ?
However much the ballet might have claimed his attention, Franz was too deeply occupied with the beautiful Greek to take any note of it; while she seemed to experience an almost childlike delight in watching it, her eager, animated looks contrasting strongly with the utter indifference of her companion, who, during the whole time the piece lasted, never even moved, not even when the furious, crashing din produced by the trumpets, cymbals, and Chinese bells sounded their loudest from the orchestra.
Patterson sees and must see a permanent and perpetual obsessive attention and consequent tension; I think that the most apparent and consistent attitude of the free Greek to the slave was to ignore him him, not to be conscious of him.
Maria Menounos, Access Hollywood Correspondent and author, is joining Yoplait Greek to help spread the word.
Registered Dietitian Christina Meyer-Jax agrees and has teamed up with Yoplait Greek to talk about the benefits of protein.
It's Greek to Me may not have the vitality and depth yet of the Great Greek, Taverna Tony and other well-known Hellenic spots around Los Angeles, but it certainly has the potential.
With comfortable but unassuming decor and furnishings, It's Greek to Me concentrates on pleasing its growing clientele with good food and a friendly attitude.