Wallaine 

That girl that got away.

Noun. The girl you dump, then realize you made a mistake.

Verb. The girl you secretly love, but won't tell her because you are too chicken shit. So she leaves your life, and you are miserable.

I didn't know what I had when I had it, but I figured it out once I lost it. You know, I pulled a Wallaine.

Wallaine by Minneth February 4, 2010

Wallvine 

What a wallflower starts off as.

That guy wasn't even a wallflower when you first met him, he was a wallvine.

Wallvine by Solid Mantis July 18, 2018