Top Definition
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".
by wizzy0807 January 31, 2011
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