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

Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from We'll never spam you.