who are you, and what have you done with (someone)

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who are you, and what have you done with (someone)

slang A humorous phrase emphasizing one's surprise at another's change in attitude or behavior, often for the better. You took out the trash before I even asked? Wow, who are you, and what have you done with my son? Look at these excellent grades! Who are you, and what have you done with Stephanie?
See also: and, done, have, what, who