1. If you miss the train, you can’t just go at another time. Your ticket won’t be worth the paper it’s printed on.
2. Make sure you spend or exchange all of your money before we leave this country; once we leave, it isn’t worth the paper it’s printed on

Synonyms: not worth a dime; not worth a plugged nickel; not worth a hill of beans; not worth a red cent. This expression is always used in the negative and usually refers to documents or money, i. e. , things printed on paper.