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Someone who suddenly and without warning, enters an area such as a party, and immediately ruins the mood for everyone else.
The party was really great, until that douche ex machina John showed up and started acting like an asshole like he always does.
by Sarah Bellum June 12, 2008
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2
The guy who enters the room while you're watching a movie and then ruins the ending.
Based off of the Greek dues ex machina meaning the "God of the machine" that would enter the play near the end and solve all of the problems the characters would have.
Guy 1: Hey you watching a movie?
Guy 2: Yeah, it's The Sixth sense.
Guy 1: Oh, I love how Bruce Willis is dead at the end of this movie!
Guy 2: Thanks douche ex machina
by bry814 September 28, 2010
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