unapromer 

(pronounced like unabomber) Someone who goes to prom by themselves.

You see Fat Megan at Grand March last night? She's such a unapromer.

unapromer by Imajackass May 12, 2008

Unproper 

Improper use of improper.

Misinformed: Oh, yeah? It's YOU'RE not your. Don't use unproper grammar if you're going to argue.

Me: *facepalm*

Unproper by ryvirchild December 6, 2010

Unproperty 

Something not propertized

The girl broke up with her boyfriend by telling him she was now unproperty

Unproperty by Safy April 20, 2010