When one of your roommates gets up and says they are going to take a "nap" when, in fact, they are actually going to go masturbate.
Nikesh: "Sorry guys, this looks like fun, but I gotta go take a nap."
Will: "Lay off the Jergens, Patel."
Chorus: "SLAPNAP, SLAPNAP, SLAPNAP."
by GunterClemson August 25, 2010
Masturbation until passing out or falling asleep. The most pleasurable of mid day activities, except when your girlfriend lets you have anal.
With no class and his roommate at a phych exam, Nate indulged himself with a slap-nap.
by ryyyyan123456 March 07, 2008

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