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NIST is Northern Irish Standard Time, a time used when you don't like the English so you can't say GMT and don't like the French so you can't say UTC.
by Piepai69 August 20, 2021
2
/nīst/ˈ noun. a person who believes that they don't have to try and rejects all ethic and moral principles. Synonyms - nissnest, chase.
by nissnest2020 July 27, 2017