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1.
(n) The disposable apparatus used to catch the ejaculated semen after masturbating. Often a tissue or napkin.
Johnny had his fapnapkin by him at his bedside
by Roastmasters September 15, 2010
 
2.
A derogatory term equating the person at which it is directed to a napkin used to clean up splooge after a vigorous fapping session.
"God, I hate (insert name), he's such a Fap Napkin!"

"Damn it, (insert name), quit being such a Fap Napkin!"
by Inebriated&Insolent September 08, 2011