Cartman Day 

A 24-hour period in which you indulge yourself in complete gluttony, narcissism and sloth, in the manner of Eric Cartman on Comedy Central's South Park.

Guy1: Did you just pound down that entire box of Krispy Kremes?

Dude: Yep, I'm having a Cartman Day. A nap, then a tub of Ben and Jerrys is next, right after I get you to RESPECT MY AUTHORITAH!

Guy2: But... you're already a fatass.

Dude: Screw you guys -- I'm going home!

Cartman Day by CA Central August 4, 2010

Cartman Day 

When an employee calls off sick who isn't because they need a mental break from an annoying, lazy, negative co-worker.

Brianna has been such a BITCH lately so I'll be taking a Cartman Day tommorow.

Cartman Day by Pjtitties January 12, 2020