Top Definition
A nightie owl is someone (more commonly female) who chooses to go to sleep in the early morning, but selects a nightgown as their choice of sleepwear.
Guy: When did you go to bed this morning?
Girl: About 4 am. But I was really rocking my nightie!
Guy: You are such a nightie owl.
by potteriffic September 16, 2009
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