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a. German word for window.

b. Also used to describe someone who is obviously sleazy. Typically a guy with scandalous, unwanted intention.
a. Oh no! It is raning! By golly, we've got to close the fenster! (the rest said in german of course)

b. I had my pepper spray ready for the eyeballing fenster. His eyes wouldn't be as active for long..
fenster by wallaby August 31, 2005

Fenstermacher 

After the great game, I have become the Fenstermacher!
Fenstermacher by Wick1212 September 30, 2011

e-fenestration 

Accidentally alt-tabbing to an equally inappropriate window when your boss/parent suddenly appears.
Man, I had like...15 windows open on my PC at work today and only one of them was the report I was meant to be working on. Clicked from Facebook straight to YouTube when my boss appeared. Just a big-arse kitten playing a piano on my screen. Complete e-fenestration.
e-fenestration by Tommy G (Syd) November 5, 2009

fenestripper

Someone who takes off their clothes while standing in front of an open window.
She was arrested when her neighbors called the cops and let them know she was a fenestripper.

fenestrate 

They won't like it, but the IT department says we need to fenestrate the entire department, including the ones who are using Linux.
fenestrate by my name is Cos April 16, 2009

The Fenestration Paradox 

The burning need (whilst stoned) to both lie down, get up and eat something, drinking something and play more Mario. This creates the ultimate paradox in that you can never be doing what you want to, despite attempting to do what you need constantly.
The Fenestration Paradox by Zeddecus November 23, 2005