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

Under-Developed Fork

An insult, coined by the Youtube channel Emkay, that originally was used to describe a fork that was not pointy, but slowly evolved into a unique insult that can be used universally.

Bob: "Bruh you Under-Developed Fork"

Under-Developed Fork by LexonTheDragon December 10, 2021

Under-Developed 

Not fully developed as in a sense of body, mind and experience. Typically known as frigid.

I know you are an under-developed 18 year old.

Under-Developed by Reggie123456 April 26, 2011

underdevelopsy 

Lackage of the package.

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

underdevelopsy by GirthDoctor January 9, 2020

IQ Underdevelopment 

When your IQ is apparently 'lower than current age standards' of your peers in your age group.
In short, nonsense about your IQ and how dumb you are.

Me : "According to my test IQ results, I have 'IQ underdevelopment'."
Human 2 : "Now, why isn't that surprising mate "
Me : F*** you !

IQ Underdevelopment by Cloudyshadow October 31, 2017