A mythical period in time which everyone knows about but has no memory of.
A lot of people say that it is the day after today and that tomorrow will be here at midnight, but if you actually wait until midnight it is today again.
Often used by people to put off work as the new required deadline will never arrive.

(noun) The day when all essays currently being written are due.

When i plan on doing my homework, cleaning my room, doing laundry, emptying the trashcans, walking the dog, vacuuming, doing yard work, taking down the x-mas lights and finding a job.

When the sun will come up. And you can bet your bottom dollar. Plus, its only a day away.

a mythical place where everything gets sent to, to be done and it never happens

Maybe the next day, or maybe a week from today. It's a generic term for the future, ≥ 1 day and ≤ 1 week.

the day that keeps you going!! the thing that lets you know everything will be ok! or it’s the day you have great plans for. maybe your best friend is coming over. maybe family is coming in from out of town. tomorrow is great!!