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Fap Itis is referred to the sudden onset of drowsiness following a fap (masterbation) session.
John: Hey bro wanna go chill or something?
Rick: Nah man I've got the fap itis.
by negev September 12, 2013
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Apr 28 Word of the Day
Literally everyone, ever. Including the writer of this definition.
by masokitsune January 17, 2019
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