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a horrible pixelated shot of an underdeveloped highschool freshman in their underwear trying their best to make a seductive face 

The default picture used by over 84% of users of the popular networking site myspace (See definition #4).
-Man, she looks fine!
-Can't you tell? That's a horrible pixelated shot of an underdeveloped highschool freshman in their underwear trying their best to make a seductive face, dude.

underdecking 

conspiring against an authority figure to take synchronized shits underneath said authority figure's deck. Usually performed in groups of two to five people. In extreme cases, shit burritos are fashioned with paper towels and left to be found.
Oh, no. Have you seen the kids? I hope their not underdecking us again!
underdecking by underdecked July 2, 2009

Underdown 

Simply the coolest surname in the world!!!
"Man I wish I was an underdown"
If taylor swift said that to me, she could become one anyday XD
Underdown by Mr. Clever ;) June 29, 2011

underdesking 

The office skills utilized by those who prefer to smother their bosses undersides with their noses and kisses.
Although Jill's typing and filing skills lack any true ability, her underdesking talents may be the reason she is till employed.
underdesking by Tim Wethers May 1, 2006

thomas underdown 

A kid who's fortnite skills are worse that Owen Stonmans aimbot and is a small being.
Your Fortnite skills are worse Thomas Underdown
thomas underdown by AFortnitePro January 25, 2018
If a guy's a slut and especially when he brags about it, he can be called a dirty dawg.
An underdawg is a guy who's a slut but keeps it on the down-lo.
A: "Corr that guy's a bit fit... I bet he's a dawg"

B: "Yeah but don't worry he's and Underdawg, you can get with him and you won't have to worry about him spreading it."
Underdawg by Ferinus August 18, 2010