Numbfuck 

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!

Numbfuck by RosalineG April 25, 2009

NumbFuck 

Lacking in brain power

You numbfuck can't you get anything right!

NumbFuck by Kelly July 18, 2003

numbfuck 

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.

numbfuck by Mr. Normal May 19, 2007

nubfuck 

To fuck with a nub. For instance, if you have no arms, but you have nubs, you can insert your nub into someone else's region, and thereby nubfuck them.

Micaela: "Oh God, your nubs are so tender!"
Nubby: "Yeah, I'm pretty good at nubfucking."

nubfuck by IndieSnob November 25, 2006

numfuckery 

an abundance of stupidity or stupid actions

i walked into a room and was surrounded by numfuckery

numfuckery by i didnt know October 6, 2016

numb-fuck

When a couple is having sex and all of a sudden the man loses his errection.

Dave: Shit, NO! Not again. I losing my errection.

Sandy: SHIT, Dave you're such a numb-fuck.

numb-fuck by R_Courtlandt January 12, 2009

Numbsuck your asshole 

When you suck someone’s ass so hard, it feels numb

I’m gonna numbsuck your asshole so hard tonight.

Numbsuck your asshole by LilT17 May 14, 2020