When someone is so bad at fucking that you can barely feel it, they can be called a Numbfuck.

Numbfuck 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 numbfuck!
Girl 2: Ah, that's too bad.

or

Woman: Angelica! Why did you put the butter in the microwave? You're a total Numbfuck!
by RosalineG April 25, 2009
Get the Numbfuck mug.
One who preforms mindless and seemingly unrewarding activities over and over again. Often used as a synonym for fucktard or stupid. Do not confuse it with dumbfuck.
Due to the large number of numbfucks 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 numbfuck who mistakenly believes that its fun to just click reject on everything they see.
by Mr. Normal May 3, 2007
Get the numbfuck mug.