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Actual Pigs

Sometimes it's important to get the pig someplace quickly, usually for breeding. The pig is loaded as cargo on a specific type of plane and flown to meet their date.

The Idiomatic Expression

"When pigs fly" is a metaphor for saying that something will never occur.

Because pigs do not have wings, making it impossible for them to fly (on their own), it is virtually certain that this will not occur. When asked when something is going to occur, the response "when pigs fly" means that it will not ever be done.

So the expression "when pigs fly" is the equivalent of saying "it is not going to happen" or "I'm not going to do it."

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12y ago

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