NumbFuck

lacking in brain power
you numbf-ck can’t you get anything right!
when a couple is having s-x and all of a sudden the man loses his errection.
dave: sh-t, no! not again. i losing my errection.

sandy: sh-t, dave you’re such a numb-f-ck.
when someone is so bad at f-cking that you can barely feel it, they can be called a numbf-ck.

numbf-ck can also be used as an insult to someone who is blindingly stupid.
girl 1: omg, brad and i did it last night!
girl 2: really? how was it?
girl 1: he’s a total numbf-ck!
girl 2: ah, that’s too bad.

or

woman: angelica! why did you put the b-tter in the microwave? you’re a total numbf-ck!
one who preforms mindless and seemingly unrewarding activities over and over again. often used as a synonym for f-cktard or stupid. do not confuse it with dumbf-ck.
due to the large number of numbf-cks who attempt to add the names of their friends and pet goldfishes to the urban dictionary who are clogging the system, this definition will likely languish for six months before being reviewed and ultimately being rejected by another numbf-ck who mistakenly believes that its fun to just click reject on everything they see.
where a man repediatly smacks his hard c-ck on a female’s tw-t until it becomes sore. then he takes his hand and smacks the cl-toris, and immediatly pinching it afterwards. the man would then take his hands and cuff the c-nt as hard as he can to prevent blood from entering the beat p-ssy. this would cause the p-ssy to fall asleep. once the c-nt turns blue/purple the man grabs his c-ck and f-cks the numb tw-t. the female should now feel an odd sensation of blood rushing back into her p-ssy combined with an -rg-sm.
an example of “blood rush” would be someone tightly cuffing your wrist. causing your hand to fall asleep because the hand 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 f-ck” practice.
where a man repediatly smacks his hard c-ck on a female’s tw-t until it becomes sore. then he takes his hand and smacks the cl-toris, and immediatly pinching it afterwards. the man would then take his hands and cuff the c-nt as hard as he can to prevent blood from entering the beat p-ssy. this would cause the p-ssy to fall asleep. once the c-nt turns blue/purple the man grabs his c-ck and f-cks the numb tw-t. the female should now feel an odd sensation of blood rushing back into her p-ssy combined with an -rg-sm.
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 f-ck” practice.