It is an accepted informal use, used to emphasize that something is very noticeable in the stated way: What a film - talk about boring! Talk about the weather! It has been dreadful Talk about the government!
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Feebs11It is an accepted informal use, used to emphasize that something is very noticeable in the stated way:I know. My question is about the etymology; how have you native speakers come to understand it that way?