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Someone who is up at night and normally sleeps through the day.

2) one who is more active at night than through the day.
My nocturnal friend is always up at 3am and ends up not coming into school be ause he went back to sleep
nocturnal by YOU'RE A SPOON May 8, 2016
"the icecream man came to my street at 2 am.. nocturnal bastard!"
nocturnal by Anomynous April 5, 2005
The natural state of college students.
"My roommate is asleep at 3 PM. I haven't seen her awake in a week."
"Oh; no worries. Mine is too. She's nocturnal."

"Dude, your paper is due in 12 hours."
"I'll get it done. I'm an owl, nocturnal."
nocturnal by Nocturnal_Owl December 31, 2011
the best skateshop in the city of philadelphia. owned by kerry getz and mark brandstetter.
NOCTURNAL SKATESHOP PHILLY PA 19147.
Nocturnal by xxcuntbagsk8r57xx August 16, 2009
When you're playing Black Ops and your shooting someone, and a guy on your team is behind you and steals your kill.
Yo, i was shooting this dude, and this douche behind nocturnaled my kill.
Nocturnal by battman811 January 7, 2011
the act of attaining pleasure through inserting a full fist into ones rectum
Tom claimed he stayed up all night doing his english coursework, but i'm sure he's nocturnal
nocturnal by adka November 13, 2004