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1.
It's just the background image located behind the "Urban Dictionary" logo. It just so happens you might accidental drag it into the box when trying to click inside the search box.

I'm certain we've all encountered it at least once.
http://static3.urbandictionary.com/images/header_background_right.jpg?1240619761

It's just the background image.
by Da Milkman April 24, 2009