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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!!!!

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