ولسان حالي يقول
I'm wondering about the register of ولسان حالي يقول. Is this expression formal, informal, or neutral? Is it standard, used in dialects, or both?

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و لسان حالى يقول 
Is formal written in Arabic books, poems or TV programs and it's Fosha not used in our daily language

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It is formal and Fusha. You might hear it in a program when they use MSA.
Also, we use it within our slang speech to give our speech some value.

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هل تتسأل حول عبارة (لسان حالي يقول)