Top Definition
The day after Sunday Funday, when you are hungover at work and feel dumb for drinking so much the day before.
I can't believe I drank that much again. I hate Monday Dumbday.
by Rynomite13 August 16, 2010

Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from We'll never spam you.