Top Definition
Staying up so late over winter/spring/summer break that you are sleeping through almost the whole day.
Todd: Dude, I've been texting you all day, why didn't you answer?

Mike: Sorry bro I've been so borderline nocturnal lately that I couldn't check my phone until now.
#nocturnal #normal #break #sleep #abnormal
by blerghhhhhhh January 07, 2013
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