The later part of Sunday when one is busy working to be ready for Monday. Smonday is a very taxing period of time, usually involves no sleep the night between Sunday and Monday. Involves large amounts of caffeine intake. More relevant to business executives and students.
Example 1:
"I can deal with Monday but it's Smonday that kills me."
Example 2:
Boss: "Venkateswaran, lets have the reports ready on my desk by Monday morning. And enjoy your weekend buddy!"
Venkateswaran (to himself): "Enjoy my weekend my &*%! No sleep two Smondays in a row, damn it"
"Smonday" is a word you would use if your partying goes a little beyond normal standards and escalates into Monday, technically under those circumstances it's not really a "Monday" so to speak.
Strategically fusing your Sunday with your Monday using copious and various amounts of alcoholic beverages. On a Smonday one may be seen in his or her same attire he or she did or did not sleep in from the night before. Smonday will commence as soon as a Saturday is over.
In order to truly celebrate a Smonday, one must be extremely hungover from the night before.
"Oh my gosh! I saw Susie in that same outfit last night at the club, now she is drinking Mimosa's at Denny's and its only 11:30 am...she is having one hell of a Smonday!"