Top Definition
Persnicketous is the noun form of the adjective persnickety. Essentially, it describes all of the small details to which people, particularly those with OCD (Obsessive Compulsive Disorder) attend. The noun has the same form for both singular and plural uses.
"OMG my friend Jessica was working doing her AP Chem practice problems, and still wrote out all of the units and everything! The teacher is not even going to check it!"

"Dang, she must love to focus on the persnicketous."
by mataxu February 25, 2014

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