All Greek To Me
When something is incomprehensible due to complexity or incorrectness. If a person is having difficulty in understanding, the common idiom All Greek To Me is often used to express those sentiments.
The popular expression All Greek To Me was used in plays during the 17th century by people such as an Elizabethan playwriter named Thomas Dekker. Here's a quote from the play:

"I’ll be sworn he knows not so much as one character of the tongue. Why, then it’s Greek to him."

This phrase is also used by Shakespeare in some of his plays.

Source: Wikipedia
This Popular Expression Used In Sentences:

"My parents were yelling at me, but it was all greek to me as I couldn't really make out anything they were saying."

"The rules of football don't make any sense, they are greek to me."

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Common Phrase Origins and Meaning  > All Greek To Me
Note: The precise phrase origins for most idioms is not possible to locate. What's shown here on this page is typically around the earliest time a saying is began being used in a book, newspaper, poem, or what-have-you.

The meaning of idioms usually changes over the decades until it morphs into modern definition we all know and and use.

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- Greece's terrain is mostly made up of mountains. The tallest mountain in Greece is Mount Olympus, towering in at over 9000 feet (1.7 mi) high.

- The Olympic Games that occurs every 4 years in modern times originated in Ancient Greece.

- Greece's population is around 11 million people.
Meaning of phrase All Greek To Me
Origin of the expression All Greek to Me
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