Shorthand for notebook, those lovely 70-page, spiral bound masterpieces of history notes and math problems.

Used when you simply don't have the time to write out all eight letters, or as an affectionate name for a diary or journal.
(from an assignment book) hw: find nbook, do maths, page 137

Dear NBook,
I have a crush on Josh. I'm so embarrassed! What if he finds out?!
by Lady Chevalier October 4, 2005
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