When you send an email before you're ready to send.
You might hit send accidentally or your cat walks on the keyboard and sends it for you or the next thing you know, the email has been sent even though you haven't even touched the keyboard.
The prematurely send-jaculated mail definitely isn't ready to be sent as it might be halfway written, have a lot of typos, or be too rant-y or stupid to be sent, hence causing embarrassment when the email reaches the recipient.
Co-worker to another: I just hit the wrong key and sent half an email to the boss that I shouldn't have!
While one is snowboarding, they feel the sudden urge to jib the closest thing to them wether it be a tree or a four year-old's snowboard while he is sitting down. It is a very serious and very common disease among people who have an excess amount of steeze.
The act of celebrating an event before it has been fully resolved. Sometimes quickly followed by an embarrassing retraction when things turn out differently.
The Pulp Fiction quote by the Winston Wolf character "Let's not start sucking each other's dicks just yet, Gentleman." is a great example of premature joculation.
1.)When you celebrate a win by dousing the coach in gatorade before the game is over, and you end up losing.
2.)When you celebrate a touchdown and spike the ball before you make it to the endzone, and look like a retard when it is called back. (DaSean Jackson, T.J. Jones).