UnderBeats 

The absolute best music YouTuber and Voice actor get him to 100 subs he deserves it, he is currently at 45

Person 1: UnderBeats is the best music VA
Person 2: Yeah, he also do be like sans

UnderBeats by The Absolute Unit September 8, 2020

Underwears in the air

When someone is showing alot of attitude, it is appropriate to use the phrase , "THERE ARE UNDERWEARS FLYING EVERYWHERE IN THE AIR!!!"

GUY 1: Oh my GOD!!! YOU LOOK SO LIKE FUGLY EIEWWWW

GUY 2: OH MAN THERE ARE UNDERWEARS IN THE AIR!!!! I THINK A HOT PINK UNDERWEAR JUST GOT STUCK ON MY FACE

Underwears in the air by T'Resa November 3, 2018

underbreastimate 

to underestimate the size and/or weight of ones breasts.

be careful not to underbreastimate a women's tits; they are known to suffocate small animals and children!

underbreastimate by Matt Huff October 6, 2011

Underbreasts

noun: the area underneath a woman's breast.

"ooh love, this hot weather isn't half giving me sweaty underbreasts."

"lift your tits up darlin', I'd like to lick your underbreasts"

Underbreasts by Velma0501 January 15, 2009

underseat treasure

uhn-der-seet trezh-er
noun

Loose change and other items often found under or between furniture cushions (especially couches), automobile seats, and other such places where stuff falls out of your pockets and you usually can't find it without crawling on your hands and knees.

Origin: This is a common enough phenomenon that I decided there needed to be a term for it. It is a play on words from the phrase "undersea treasure".

College dude 1: “Man, I need a Mountain Dew for tonight’s cram session, but I spent my last quarters on the laundry machines…”

College dude 2: “Look around the dorm lounge, dude. There’s bound to be at least 50 cents in underseat treasure there…”

College dude 1: “Thanks, bro; I never thought of that!”

College dude 2: “That’s ‘cause you’re a pothead. Anyway, try to steer clear of the used condoms.”

underseat treasure by Vonthako November 2, 2009

underbreath

The medium in which something is rendered at a whisper; the physical carrier of something uttered under one's breath.

I barely heard what Jeff said to Tony on his underbreath.

underbreath by notalawyerbutplayoneontv January 14, 2010

Underbeard 

Facial hair that grows on the underside of the chin. This style of beard is frequently sported by the overweight, in which case it technically resides on their second chin.

"Kids, take a page from the Underbeard King and get rid of your neckal hair,
`cause you're lookin' like Chewbacca did a face-plant into Nair."

~ excerpt from the traditional Ballad Of The Underbeard

Underbeard by forkbomb October 24, 2008