Super Bowl Monday
The Monday after the Super Bowl where you are still hung-over and wondering what you actually did, who won, and why you had so much to drink.

You often must go back to work, school, ect. which makes it that much worst.

It's a specific Case of the Mondays.
Dude 1: Hey dude. I saw you making out with Jill in Lori's kitchen yesterday. Now that's what I call a Touchdown.
Dude 2: Oh, that's what I was doing durring the last quarter. Who ended up winning again?
Dude 1: The Colts man. You're havin' one bad Super Bowl Monday.