not worth the paper it's printed on

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not worth the paper it's printed on

Useless; unimportant; insignificant. Oh, that memo is not worth the paper it's printed on. You know the boss is going to completely change her mind about it in a few days anyway! Due to the recent hyperinflation, the nation's currency is now not worth the paper it's printed on.
See also: not, on, paper, print, worth