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1.
someone who tends to stay up late into the night
Most kids these days are night owls. They sleep at wee hours of the morning and get up late in the day.
by regal_aeros May 10, 2009
 
2.
Someone who stays up late and sleeps in the day.
"Tash and Ben will be awake, they're both nightowl's.
by Diego July 07, 2003
 
3.
A meth user that stays on the pourch all night at a the meth house, watching everything, usually a paranoid tweaker.
look at all those gackulas on the pourch, damm night owl
by S. 22nd street October 18, 2006