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...

underglow by Hubs August 3, 2003

underglow 

a very cool band from the Lincoln area. Go see them they rock good

Underglow they are ace

underglow by dave the god October 3, 2003

undercrown 

In porn, the camera shot where all you see is the dude's asshole and balls slapping against whoever they are fucking

Man: I'm just trying to get off, I don't want to see this undercrown shot in my vaseline stroke.

undercrown by baller722 November 26, 2013

Undercrown 

The shot in porn where all you see is the dude's asshole and balls slapping against whoever they are fucking.

How am I supposed to watch porn when all I see is Undercrown?

Undercrown by thatguy1645 November 26, 2013

Underground Aussie Hip Hop

A non-commercialised non-profit Rap scene. A style of Australian rap music where rappers choose not to 'sell out' to Record Conpanies & instead produce their own Recordings whilst maintaining other forms of financial income.

Guy a) bro, u know any good Underground Aussie Hip Hop beats?

Guy b) yeah sus out #undergroundaussiehiphop on Instagram! Google Celebrity Pete Laan is a fan of that shit

Underground Aussie Hip Hop by Scriptures April 23, 2017

undercrown 

An undercown is that shot in porn where all you see is the dude's asshole, and balls, often switched to right after some hot and heavy action, in order to make the viewer dump his load to the view of a man's sweaty balls

I was jackin it to some pron last night and right before I came they switched to an undercrown ... Am I gay now?

undercrown by JohnJacobJingle-HeimerSchmitt November 26, 2013

Underground 

Un•der•ground (un’der ground’), n., adj.

1) A genre in music and other forms of media intended for an elite audience, that is often characterized by its high levels of originality and experimentation, and does not conform to typical standards, trends, or hypes as set by the popular mainstream media.

The mainstream media has a tendency to steal new ideas from the underground.

Underground by Essix April 16, 2005