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A insult or a disease where one gets a flap in there nuts like a shark fin
Scott: “Oh I’ve got nutflap as the disease my doctor diagnosed me with it”
Jenson: “good you but face”
Nutflap by OOPLAH911 October 3, 2023

Nutslapper

A tremendously long bowl movement which, upon evacuating the rectum, falls forward, slapping the back of the scrotum before falling into the toilet.
Nate took a huge dump. One turd in particular was so long that it wound up being a nutslapper.
Nutslapper by thezfunk March 10, 2010

Atomic nutslapper

An Atomic Nutslapper is when you are getting head and your girl starts to punch your testicles like a boxer using a speed bag.
Person 1:Yo I heard you got head from Misty and she gave you an Atomic nutslapper
Person 2:Yeah my fucking testicles hurt bad
Atomic nutslapper by fuckcalebs November 24, 2019

Napalm Nutslap 

When your partner uses a propane torch to rid your nutsack of pubes and slaps the fire out
There's nothing like a napalm nutslap to get primed for sexy times
Napalm Nutslap by Bozfelcher November 6, 2018
to move your hips up and down in a humping motion so that your scrotum swings up and down giving the appearance of your "nuts flapping".
I saw robert in the hall today doing the nut flap.
nut flap by Alden aka Ginger July 28, 2008
the sounds your nuts make when slapping the ass of your partner during heightened sex

Also, a good term for someone you might already refer to as douchebag.

See douchebag
Your mom likes my nutslap
nutslap by jacobsack December 4, 2003
More from Urban Dictionary

square grouper

Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.
"Base we've got some square groupers floating outside of Miami harbor."
square grouper by slipsheet November 6, 2004
Word of the Day on October 7, 2026
A girl who does ballet and only talks about ballet. Her schedule is filled with dance classes which does not allow her to do any other activity.
"Hey, do you know that girl Sally?"

"Yeah, she's kind of annoying. All she ever talks about it ballet."

"Wow, what a Bunhead."

"Hey Sally, you want to hang out this weekend?"
"I can't, I have dance."
"You're such a Bunhead."

"Yeah... I know."
Bunhead by Jen00 October 24, 2014
Word of the Day on October 6, 2026

trucker's tan 

A sunburn or suntan focused on the left arm. It is caused by the left side of the body being the only half that gets exposed to sunlight while driving. Presumably, it would be located on the right side of the body in countries where they drive on the left side of the road.
I had a trucker's tan after driving for 10 straight hours on a sunny day.
Word of the Day on October 5, 2026
The phenomenon where adults salivate at children's toys
Every time I walk into the toy aisle, I catch myself kidulting over the latest action figures and LEGO sets!
kidulting by Emotional Cruiser October 12, 2025
Word of the Day on October 4, 2026
British slang for a scientist or technical expert, esp . when the speaker is not certain of the expert’s specific field of study. Not necessarily derogatory, but typically used by persons without a technical background. In the US, the equivalent would be “egghead”, “squint”, or “geek.”

Origin of the word is unknown. Started sometime in World War 2. Given the typical evolution of British slang, could easily have started because what these experts did was confusing or “baffling” to the common person.
According to the boffins downstairs, the murderer used a serrated blade.
Boffin by Agnon February 11, 2023
Word of the Day on October 3, 2026
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