Bass said:"Deus Ex Machina" literally means "God in the Machine".
It is a storytelling term.
It comes from Ancient Greece where the playwright would end up with all his characters frenetically caught in an exciting and tense position with no way out (like all good stories) - then two actors (playing Apollo and Athena or what not) on pulleys are descended onto the stage (hence "Deus Ex Machina") and they reward the righteous and punish the villainous. Then, the story resolved, they return to Mount Olympus.
It is a term used to describe the greatest sin of a writer - to end your story on coincidence, on random chance, ending your story by removing all consequence and responsibility from your characters.
(It's worth noting, that it is possible to make a deus ex machina ending actually work - it is however, extremely difficult to do. But that's a lesson for another time.)
Upload some deus ex machinas that you find. The higher profile the better.