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belly underflap 

Protruding fat mass between the belly-button and the upper pelvis whose shape has been severely affected by the action of gravity.

Demographically, the belly underflap is most common in senior men who drink a lot of beer and women in their thirties who tend to choose extremely tight clothes.

Belly underflap is also observable in successful biggest loser contestants
boy 1 - "Hey dude! Check-out that girl's belly underflap!"
boy 2 - "Yeah! Yesterday she was totally hawt, but today she looks like T-1000 in the molten iron pool!"
belly underflap by jtuf January 6, 2012

Underfluffies 

The fluffy feathers underneath the tails of birbs, covering their butts.
I showed you my underfluffies please respond
Underfluffies by ProjectOWL August 2, 2018

underfletched 

Hey Jack! Wanna Play Some Fortnite?
Sure! Lets Invite UnderFletched
underfletched by wag1pffting April 27, 2019

Underclass Hero 

The latest album by the very successful band Sum 41.

It is their first album since guitarist David "Brownsound" Baksh left.

They did, however, incorporate another guitarist for recording and touring, Thomas "Brown Tom" Thacker, but will not include him in band photos or the crew list.

The new album includes hits such as Underclass Hero, Walking Disaster, and March of the Dogs. The other songs are Speak of the Devil, Dear Father, Count your last blessings, Ma Poubelle, The Jester, With me, Pull the curtain, King of Contradiction, Best of me, Confusion and Frustration in modern times, and So Long Goodbye.

I recommend this album to any fan of the band. Actually, I recommend it to anybody.
Just picked up Underclass Hero. It's amazing, dude.

Even without Brownsound?

Yeah!

Amazing!
Underclass Hero by Briiiiin September 26, 2007

underappreciator 

one who does not give true value to a certain item of extreme value
Jasen did not give give my trade in it's proper value and blamed it on John, he is such an underappreciator!!!!
underappreciator by undervaluer July 16, 2013

underfag 

People in the Undertale fandom. They tend to be made fun of for being butthurt and cringe-worthy. Among other things, they are also annoying.
Hunter: Undertale sucks.

Underfag: Hey!! Undertale is good the fandom just sucks but Undertale is good and has good ships lol XDD!! Everyone has their own opinion!
Hunter: Then let me share mine.

Underfag: You're just being stupid let me have my own opinion!

Preston: They took the bait.
underfag by IgnitingInsanity May 26, 2016
More from Urban Dictionary
anyone who succeeds in disgracing/over indulging themselves in the throws of clubland
28 hours and 4 clubs later, gurning for england but still refusing to go home - a total wrongun!!
wrongun by bevvers March 21, 2007
Word of the Day on October 8, 2026

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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