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A declaration used to express surprise and disbelief while also conveying contempt and/or indifference at the same time. It also deftly references a more popular expression with a similar meaning.
It is often expressed in a deadpan or sarcastic manner on extreme exclamations towards trivial events or vice versa. It can also be used to respond to FML or MLIA moments.
Person one: OMG I just tripped on the side walk!
Person two: Well That's Fun.

Person one: The Microwave just asploded and started a small fire.
Person two: Well That's Fun.
by lllJARlll January 22, 2010
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