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.

a horrible pixelated shot of an underdeveloped highschool freshman in their underwear trying their best to make a seductive face by cchriss92 August 9, 2007

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

Cuban Underduck 

When you bend your dick down and back, and a girl blows you from behind with her nose on your butt hole.

"I got a dandy Cuban Underduck from the broad I met at the bar last night."

Cuban Underduck by TurdFerguson21 June 3, 2016

Underduded 

When a chick steadily dates a dude that is not as attractive as she is.

Dude, what is Lisa doing with that dork? She is so underduded.

Underduded by 51Westside June 23, 2011

underduck 

On a swing set, where the person goes under the swing and then lifts the swing, typically what moms, dads and babysitters do to toddlers. But i've seen teenagers challanging each other by making there friends give them underducks.

i remember 7 years ago, when i was little my mom gave me an underduck, and In the GIF i attached it shows exactly with an underduck looks like

underduck by username420 December 4, 2020

underdevelopsy 

Lackage of the package.

My younger brother suffered with underdevelopsy for most of his teen years

underdevelopsy by GirthDoctor January 9, 2020

underdue

The state of any person on a project where the first date or time for a task has yet to occur.

While Bob was not the sharpest pencil in the drawer, he WAS always able to report his tasks as under control and underdue in project status meetings. He did this by providing excessively estimates for his portion of the work at planning time.

underdue by You rReal Name February 24, 2022