The act of ejaculating in ones hand and forcibly smacking your partner's buttocks with enough velocity to make the semen fly from the hand, like high-fiving someone with a hand full of foaming soap, thus creating a mess that you are now stuck with.
Jackie was making me so horny, so I cummed in my hand smacked her ass, what a moist spanky!
moist spank semen
moist spank semen
by yoho20 October 1, 2014