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Someone who believe he/she can stay up the latest at night or often is only awake at night and sleeps in the day. However, his/hers belief is flawed because in reality he/she isn't staying up late at all.
Kai: "I stayed up until 9:00pm last night! I'm sooo nocturnal!"

Peter: "dude...9:00pm isn't late at all, you are such a nocturnal poser."
by NocturnalChampion August 02, 2009
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