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8.
An event or climax that is extremely built up to and hyped, only to turn out to be a completely boring and utterly unimpressive waste of time.
The ending to Michael Crichton's The Andromeda Strain.

"Wait...the completely unstoppable supervirus turned into a non-lethal form. Now it eats rubber instead of killing people! We are saved!"

Reader: "What a fucking cop out."
by Desmond Jones May 07, 2006
 
9.
Is a way to get out of school, because you didnt get your girlfriend a Valentine gift.
OMG! My boyfriend ben totally coped out and skiped school, to have more time to get my last minute shitty gift!
by Cop out February 14, 2005