Katilsday 

A fictional new day supposedly invented by NBC to accommodate another night of the televised news magazine "Dateline", as claimed by the comedy show Family Guy.

Lois: I saw it on "Dateline Katilsday".
Peter: What the hell is Katilsday?
Lois: It's a new day NBC invented so they could have another "Dateline".

Katilsday by wizzy0807 February 20, 2011

gatilsday

NBC invented a new day so they could add another Dateline. (from the Family Guy, Sunday nights on FOX)

Lois Griffin: I saw that on a two-part report on Dateline Tuesday and Dateline Gatilsday.
Peter Griffin: What the hell is Gatilsday?
Lois Griffin: NBC invented a new day so they could add another Dateline.

gatilsday by Mike Vasquez September 26, 2005

Katillsday

(n.) The day between Saturday and Sunday. At 12:00 in the afternoon on saturday, it becomes katillsday until midnight, then it becomes sunday.

"I think that we should go into the city on Katillsday. . .how about you?"

Katillsday by stomp May 13, 2005