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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.
A: *wakes up* Man I feel like shit... what time is it? we've got to go meet up with Sasha
B: That was yesterday. It's Monday today. And we're late for Uni again.
A: Shit whatever happened to sunday?
B: It's not sunday, It's Unday.

Sunrise on Friday, dPercussion on Saturday, Rave Saturday evening, Afterparty on Sunday, then it's Bank Holiday Unday.
unday by rasfuk September 23, 2006
Related Words
unday uday Ungay unda undyne undate Ungayed undateable Udaya Udayan
Undyne is a badass woman who can flex a rock for no reason!
Undyne is undying!
undyne by Undertale Flowey April 3, 2016
A lesbian warrior fish from a game called Undertale.
Undyne is a fucking badass.
undyne by MrDeppresst November 14, 2018

undyne the undying

A badass that will kill you make you rage and brake your computer
Mom I broke my screen fighting undyne the undying
An act of being Cunning , crafty and foxy. Came from the south Indian language , malayalam. This word is most popularly used for fraud behavior
He's a world udayip , don't ever trust him
Udayip by A Mallu October 1, 2011
When you say something you regret saying and wish you could unsay it.
I wish I could unsay that your ass looks big in that dress.
unsay by Nonflyingfarang January 16, 2014