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2.
The first Monday after the end of No Shave November.

On this day, men shave their faces after a month of neglect; leaving nothing except a mustache style of their choice.
Everyone thought John's fu manchu was hilarious on Mustache Monday.
by Loudly December 17, 2009
 
1.
The Monday after No Shave November, where you shave all your facial hair except the mustache.
-Dude, are you excited for Mustache Monday?
-Yeah, mine's going to be real nasty
by Nashty November 27, 2008