Top Definition
when your level of fail becomes just as natural as your bodily processes.
Guy #1: Dude, I swear that's the 5th time John accidentally hit on his sister while out clubbing.

Guy #2: I think John's a prime example of circadian fail.
by Seargant007™ August 30, 2010

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The Urban Dictionary Mug

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The Urban Dictionary Mug

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The Urban Dictionary T-Shirt

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