Window Five 

When you are engaging in intercourse in front of a window and your friend is in a window adjacent from yours, and you both simultaneously "high five" your windows as if high fiving each other in person.

Dude I was doin Betty in the butt last night and Window Fived Mike across the way.

Window Five by TonyBruhh November 10, 2010

Five Fingered Widow

Right Hand of a newly married man

So you won't need the five fingered widow on your honeymoon.

Five Fingered Widow by Blue Cawdrey November 18, 2004

Windowfile 

Constantly looking out the window at other people

My neighbour constantly tells me that "there's a windowfile over there!"

Windowfile by Eddy Banana July 15, 2022