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1.
A deep, obsessive concern with unanswered questions about the meaning of life and existence, resulting in the disruption of one's daily life and characterized by long or short-lasting bouts of apathy and depression.
"Dude, what's up with Steve?"
"He's been reading a lot of Nietzsche and watching How the Universe Works on the Discovery Channel, now he's having an existential crisis."
by Jimmy Banks November 25, 2012
 
2.
Existential crisis in the works:
Dan: Making some cereal......why do I exist? Life is pointless....
Dan: Time to make a video! So fun! .....One day I and everyone I love will be dead. We're so alone in the universe
by dungman October 14, 2013