The magical day before Monday and after Sunday. The perfect day to plan to do things you can't really afford the time to do during the week. Alternatively, anything you can't remember when or if it happened, say it happened on Smonday.

Originated from some confusion when a weekly TV guide missed the date between a Sunday and a Monday, leaving the only explanation that the missing date fell on a Smonday.
"Do you fancy going to the theatre this week Bob?"
"Yeah, but I'm really busy and can't really afford it. Can we go on Smonday?"

"Do you remember when you tripped up and your wabs fell out in front of all the guys in that club?"
"Erm... that never happened!"
"Erm, yes it did! I think you'll find it was last Smonday."
by mary moo May 16, 2005
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That moment on Sunday Afternoon when the realisation that you have school tomorrow and you didn't do any of your homework. Its a miserable, awful time and usually ends with tiers. Its basically that feeling when you realize the weekend is over in less then 12 hours and you have to wake up at 5am tomorrow.
Guy 1: Yo bro whats up?
Guy2: Oh nothing just kinda depressed.
Guy 1: What, why?
Guy 2: I just got that Smonday Feeling.
Guy1: OOf
by blahblahblah321123 November 18, 2021
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