when pigs have wings

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when pigs have wings

At a time that will never come to pass. (Used to show skepticism or cynicism over someone's hypothetical remark.) Bob: "If we could just get Democrats and Republicans to agree on a tax reform bill, we could bring the deficit down in no time." Dave: "Sure, when pigs have wings!"
See also: have, pig, wing
References in classic literature ?
The time has come," the Walrus said, "To talk of many things: Of shoes--and ships--and sealing-wax-- Of cabbages--and kings-- And why the sea is boiling hot-- And whether pigs have wings.