In Dungeons and Dragons or any other pen and paper RPG, when the Dungeon Master (or DM) invents or gives a way for the players to live when they normally would have died.
Our DM is really easy to play with. Any time we're about to die, a little De-eMus ex Machina comes along and saves us.
When an ex-smoker tries to save the rest of the smoker community by preaching their "born-again" non-smoker ways.
Mark: Damn, James is such an asshole ever since he quit smoking last year.
Dave: Yeah, I can't stand him anymore, he has an Ex-Smoker Complex.
Mark: Oh shit, here he comes...
James: DID YOU KNOW THAT QUITTING SMOKE NOW YOUR HEART RATE RETURNS TO BLAGAGAHAGBLAGBLAHBLAHBARG
When all of your friends reject you to go hang out with your ex
Shit, how do I tell her we already made plans for Sunday? Just tell her she's been ex-jected.
When your dating someone and their poor at the time and a little bit after the breakup they get rich. Time for them to pay you for your broken heart.
"Where's my money?"
"What are you talking back"
"It's national pay your ex day"
"Oh crap I forgot about it. Here's 50$"
pronounced "day-us ex much-in-uh"; a phrase that calls attention to when something extremely unlikely blatantly happens to move a story along or resolve a seemingly unsolvable problem. This would be an instance of "deus ex machina", but the concept is cliché to the point that it deserves sarcastic observation.
Will: "Can you believe that Liam Neeson immediately found that one guy in the entire Charles de Gaulle airport that marked his daughter for kidnapping, even though the airport handled over 60 million passengers in 2008?"
Lindsey: "I know, right? Uh, hello, deus ex muchina?"