that's (all) Greek to me

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that's (all) Greek to me

cliché That might as well be a foreign language, because I don't understand it at all. The phrase comes from Shakespeare's play Julius Caesar. A: "I've got some tax forms you need to fill out." B: "Would you mind doing them? That's all Greek to me!"
See also: Greek, to
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

Greek to me, it's/that's (all)

It is completely unintelligible; I don’t understand. This term, used by generations of schoolchildren, was coined by Shakespeare in Julius Caesar (1.2), where the conspirator Casca says of Cicero’s speech, “For mine own part, it was Greek to me.” In the play Cicero actually spoke in Greek, in order to prevent some people from understanding, but the term soon was transferred to anything unintelligible and has been so used ever since.
See also: Greek, to
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer