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that ain't hay

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That ain't hay.

Inf. That is not a small amount of money. (The highly informal word ain't is built into the expression.) I paid forty dollars for it, and that ain't hay! Bob lost his wallet with $200 in it—and that ain't hay.

See also: hay

that ain't hay

That's a great deal, especially of money; also, that's important. For example, He's making ten thousand a month, and that ain't hay. Originally used to describe a sum of money that is large, this phrase was later extended to other circumstances, as in She married a titled lord, and that ain't hay. [Colloquial; first half of 1900s]

See also: hay