where a man repediatly smacks his hard cock on a female's twat until it becomes sore. then he takes his hand and smacks the clitoris, and immediatly pinching it afterwards. the man would then take his hands and cuff the cunt as hard as he can to prevent blood from entering the beat pussy. this would cause the pussy to fall asleep. once the cunt turns blue/purple the man grabs his cock and fucks the numb twat. the female should now feel an odd sensation of blood rushing back into her pussy combined with an orgasm.
an example of "blood rush" would be someone tightly cuffing your wrist. causing your hand to fall asleep because the hand is blocking the blood from entering through the wrist. and when he/she lets go of your wrist, you feel an odd sensation of blood rushing back into your hand. (as described in the "numb fuck" practice.