that ain't hay

(and) that ain't hay

And that's significant. Often used in reference to an amount of money. He got a $5,000 bonus this year, and that ain't hay.
See also: hay, that
Farlex Dictionary of Idioms.

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 itand that ain't hay.
See also: hay, that
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

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, that
The American Heritage® Dictionary of Idioms by Christine Ammer.

that ain't hay

That’s a lot; also, that’s important. This American colloquialism, with its ungrammatical “ain’t” for “isn’t,” dates from the first half of the 1900s and at first was used mainly to describe a large amount of money. It was used in this sense in the motion picture The Killers (1946), where a character says, “I’m out ten G’s and that ain’t hay for me these days.” But it was also extended to other matters. Thus, a 1994 television serial, Sally Jessy Raphaël, had it: “Seven husbands! That ain’t hay!”
See also: hay, that
The Dictionary of Clichés by Christine Ammer
See also:
  • and that ain't hay
  • (and) that ain't hay
  • That ain’t hay!
  • hay
  • roll in the hay
  • a roll in the hay
  • hay head
  • hit the hay
  • hit the hay/sack, to
  • hit the sack/hay
References in periodicals archive
Tantasqua Regional High School has won 48 straight basketball games since the start of the 2006-2007 season and that ain't hay. I don't care if you are playing in the southwest county league or against the Sisters of the Poor out of Pawtucket, R.I., 48 in a row is very impressive.