What does “one of those days” mean?

a day when there are a lot of mistakes and a lot of things go wrong

How is “one of those days” used?

In The World According to Garp (1982), one line is: “It was just one of those days, Helen.”

The clip at the top of this page is from The World According to Garp (1982).

It was just one of those days, Helen.

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