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The period of time that occurs during the events of Saturday Night and Monday (or sometimes even Tuesday) Morning that nobody has recollection of after the comedown/hangover of a big weekender. After unday, you will feel like you have lost a day that you could have legitimately used for sleeping or recovering for work/uni the next day but can't because that day seems to have dissolved into nothingness and you probably knocked yourself out for over 24 hours.
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