The definition of something or someone so irresistible, that you cannot help but feel the urge to masturbate.
Did you see the tight ass on that lady? She's definitely fapalicious.
by Jehovah Josh January 31, 2007
adj. So delicious or mouthwatering you need to fap to it
That booty was sooo fapalicious.
by drdrefapper September 06, 2014