I have never heard it. Where did you find it?
Mgonzo52, your profile says you are a native English speaker. On that basis, learners will assume that everything you write is correct. Please ensure that it is.
Thread titles should include some or all of the words you are querying. The title of this thread should have been "Barren as a brick".
The contents of a post should be complete sentences, and correctly capitalised and punctuated. Your post should have read something like:
Is "Barren as a brick" an idiom?