fucklebutt 

The ultimate form of the exclamation “fuck!” Used when something very, very, unfortunate happens.

You: “my dog just died.”
Me “I’m sorry...”
You: “my sister was holding her, and...”
Me: “and what?!”
You: “and they both got run over by a bus and died.”
Me: “that’s a total fucklebutt!”

fucklebutt by The Great Shrimpini February 11, 2019

Fuckleneck 

Also known as fuck knuckle. When you're so fucking stupid knucklehead won't describe you. A complete and total dumbass.

That fuckleneck got arrested again.

Why do people fuck up and marry fucklenecks named Brandon or Jeffery?

That fuckleneck needs to be slapped.

Fuckleneck by Craci July 26, 2017

Brain Fuckler 

A mythical creature that befuddles his unwitting victim by fuckling the shit out of their minds.

Sometimes, if I'm fast enough, I catch a glimpse of the Brain Fuckler, just fucklin' the shit out of everyone... and we don't even know it.

Brain Fuckler by Pizzozo February 14, 2008

Buckle your fuckle

When you buckle your fuckle, you’re getting ready for some shit to go down.

Bob: “Hey Jon, you better buckle your fuckle.”
Jon: “Why?”
Bob: “Some shit is about to go down.”

Buckle your fuckle by Thecl June 2, 2018

fuckless fuck

An anticipated sexual romp, replete with all of the physiological signs, that winds up not being one at all.

It all started out on fire but then mysteriously fizzled into the fuckless fuck when we reached our destination.

fuckless fuck by Dr Bunnygirl August 19, 2019

Fuckleknuckle 

A person who is, or is being, an equal mix of a Fuckstick and a Knuckle head

Hey Fuckleknuckle, get back over here! Don't you know you can't just go around acting like such an idiot.

Fuckleknuckle by Whatcha thinking bout? July 8, 2011

fuckless wonder 

A sad nickname for an aging person who has reached that final pathetic plateau when they can no longer fuck.

Let’s get outta here before that fuckless wonder over there comes over and tries to hustle us.

fuckless wonder by Dr Bunnygirl May 28, 2019