underglow

more commonly known as "Neon underbody kit" it is a series of 4+ neon tubes bolted to a cars frame to give the effect of a car gliding along on a glowing surface. If you want a good example, watch the Fast and The Furious a few times.

Fast and the Furious...

by Hubs August 3, 2003

Underachiever

A person who does not perform to one's expectations.

A person who disappoints.

Dr. Manmohan Singh Indian Prime Minister
as described very well by Time Magazine. He was depicted on the front page as underachiever.

by Shobit September 29, 2012

pop under

Those annoying fucking pop ups that go behind your window all the time

Pop unders sure do suck balls

by One Eyed Milkman May 1, 2004

Underarm

The soft pocket of skin beneath the shoulder that joins the inner part of the arm to the body.

The pretty girl's underarms were soft and smooth, hairless and extremely ticklish to the touch.

by Max March 16, 2004

I understand that.

Phrase used by persons who aren't really listening to you but wish to appear to be doing so. Usually used when on the telephone so neither of you is making eye contact.

You are telling a story and your friend, who hasn't responded the entire time, suddenly chimes in with "I understand that."

by your_nu February 3, 2010

underripe

1. under 18, as in jailbait
2. having not gone through puberty yet

"I would have gave it to her...but she's underripe."

by D0TY February 17, 2003

undomesticatable

a young person usually between 25 and 30, predominantly male, who intentionally destroys committed relationships due to his relationship with the bar scene

Joe "Amy was the hottest girl you have ever dated and she would have done anything for you"
Mike "Well, what can I say, I guess I'm just undomesticatable"

New girl: Who's that, he's hot?
Bar Fly: Forget it sweety, that one is undomesticatable

by Brett Coym January 5, 2009