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What is the difference in meaning between "Are you for real" and "Are you of real" ?
By the way, Is the "preposition + adjective (for real)" structure grammatically possible?
Does "Are you for real" mean "Are you agree that it is real"? Does "for real" mean "agree that it is real"?
Are you of real is not idiomatic. Are you for real is a slang idiom that violates the general rule that the object of a preposition must be a noun or pronoun.
The idiom means, depending on context, did you really say that or did you really mean that or did you really do that. It is an expression of mild shock or disbelief.
In this case, as an idiom, one just uses it. The grammar is overridden by usage. This is true in many idiomatic expressions.
to be of real is not an idiomatic expression and also would not be used.
