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Masturbating oneself by slapping the genitals in an aggressive and repeated fashion.
Roger loves the pain and pleasure derived from a goood slap fap.

Mary's pussy was red and swollen after her slap fap.
Slap Fap by Eaton Holgoode April 11, 2017
Related Words
To prepare and execute the act of masturbation in the selected time frame of a snapchat
Person 1: "bro, mikaela sent me a 3 second snapchat"
Person 2: "were you able too..."
Person1: "yeah i chucked a mad snapfap"
SnapFap by Ryan Batten July 9, 2015
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."
slapnap by GunterClemson August 26, 2010

slapappy 

when usually ethnic women feel the need to yell and clap their hand and slap themselves when they are excited
there are a lot of slapappy people at the wendy williams show
slapappy by english honors 12 October 15, 2012

slaphappy 

due to extreme tiredness one becomes giddy with uncontrollable laughter, also described as naturally high
Jenkins:"Hey Bob! guess what?"
Bob: "What?"
Jenkins:"Fruit Loops!"
Bob:ahahahahahahaha!*laughs uncontrollably*
Jenkins:"Dude you're so slaphappy"
slaphappy by sami and syd July 2, 2006

Your Slaphappy Grandpappy 

A term made up by the 'Diary of a Wimpy Kid' used asa 'Your Mom' joke.
Substitute teacher: Greg, can you answer this problem?
Greg: Your Mama!
Subsitute tecaher: Excuse Me?
Greg: Your Big Fanny Granny!
Subsititute Teacher: Well I hardly think that's -
Greg: Your Slaphappy Grandpappy!