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1.
A generalized comeback when someone suggests for you to do something. Especially when said something is:
a) obvious
b) your job but you'd rather it not be

Most effectively used when your friend is right but you don't want to give them the gratification of admitting as much.
Friend1: "I really like this girl but I don't know what to do."
Friend2: "Why don't you just ask her out?"
Friend1: "Why don't you?"
by Jon4321232 October 19, 2007