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The day that feels like tomorrow but is really today.
When you want to refer to the next day but it's past midnight so the next day is really today.

"Oh it's already 3a.m. I am going to sleep and will talk to you tomorrowday."
by Stronz January 20, 2008
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1, n. time between the dawn and the end of today, properly used only during time between the beginning of today and the dawn.

Friend1: Oh no! It's 3 a.m. too late! Did I make you lose your time?
Friend2: No, please don't worry.
Friend1: Okay.
Friend2: Well, I'd better go to sleep now. History's homework is for tomorrowday (10 a.m.), and I didn't finish it.
Friend1: Sorry. I really made you lose your time.
Friend2: Hehehe.
by Coyote Mokie September 07, 2006
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The opposite of Tomorrow Night. The encapsulation of "tomorrow morning" and "tomorrow afternoon". Used to be more specific than just the word "tomorrow" which implies any given time between 12:00am and 11:59pm on the day after today but less specific than just "tomorrow afternoon" or "tomorrow morning".

Tomorrowday generally refers to the hours between 8am until the general hour that the sun starts to set (otherwise known as "tomorrow evening")
I'm staying up all night without any sleep. Why? This assignment is due sometime tomorrowday.
by Wardrich December 12, 2006
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