Rage writing is when something angers you so much, you grab the writing method closest to you and start creating a story based on the event that you’re pissed at.
It’s good fun, yes, but I find it most fulfilling when I reread what I’ve created and reflected upon the theme later. The reflection makes the ending and details in between very clear and solidifies the theme.
Rage writing is also a great way to make sure you write more frequently, have a healthy outlet for your emotion, and process that anger. I’m not saying you’ll turn out being a better person than you were before or that you should try to write a happy ending to your rage-written story; but I am saying, at least for myself, that this is a satisfactory method of expression and it’s going to feel damn good to publish it in time.