Monopoly money
Noun
Meaning
Play money.
Synonyms: toy currency, fun money
(slang, often derogatory) Banknotes of foreign currency; especially those which are vibrant or flimsy.
Synonyms: play money, funny money
Money, especially paper money, that is perceived to have little or no value, or to be distributed freely.
(idiomatic) Money that does not exist; referring to fraudulent record keeping.
Source: en.wiktionary.orgSynonyms
Examples
Thank those Republicans for it, Steve, because the Democrats don’t have the wherewithal to fill a paper bag with Monopoly money.