What is the origin of expression by George?

The phrase "expression by George" is not a common expression or idiom. It's possible it's a unique phrase used in a specific context or a misremembered phrase.

Could you provide more information about where you heard this phrase?

For example:

* Where did you hear it? (a book, movie, conversation, etc.)

* What was the context? (What was being discussed or the situation?)

* Who said it? (If you remember)

With more information, I might be able to help you understand the origin of the phrase.