The rare act of getting something done before tomorrow. The complete opposite of procrastination.
Zach: Oh, man. I hate English 2015. Don't you have to write your paper, too?
Billy: Nope, I joined precrastination nation and did work on that thing, got it done almost a week ago.
Zach: *breaks down and cries*
Billy: *hands him a tissue and pats his back* It'll be okay, buddy.