Mustache Monday 

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

Mustache Monday by Nashty December 15, 2008

Mustache Monday 

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.

Mustache Monday by Loudly December 17, 2009