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1. A phrase of agreement. A: "Roberta's photography is so beautiful." B: "And how. I could admire at it all day."
2. A phrase used to emphasize a statement as true. She's a great writer, and how! Her latest short story is wildly inventive.
I agree very strongly “That was a great game last night.” “And how!”
Usage notes: usually used as a separate sentence, as in the example
Most certainly; you bet: She's a good dancer, and how!