The act of pulling down your pants and whipping your penis side to side, so that it can slap your thighs and make a loud clapping noise, the faster and harder the better
WOMAN: "Hey jeff do the kappa slappa for me"
JEFF: "OK, let me take off my pants"
JEFF's Penis: "CLAP,CLAP,CLAP,CLAP"
© 1999-2015 Urban Dictionary ®
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