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Urban Dictionary is a crowdsourced online dictionary for slang words and phrases, operating under the motto "Define Your World." The website was founded in 1999 by Aaron Peckham. 

you really pasted the description on Wkipedia

i'm bored to death
Urban Dictionary is a crowdsourced online dictionary for slang words and phrases, operating under the motto "Define Your World." The website was founded in 1999 by Aaron Peckham. Originally, Urban Dictionary was intended as a dictionary of slang or cultural words and phrases, not typically found in standard dictionaries, but it is now used to define any word, event, or phrase (including sexually explicit content). Words or phrases on Urban Dictionary may have multiple definitions, usage examples, and tags. As of 2014, the dictionary had over seven million definitions, while around 2,000 new entries were being added daily.
Urban Dictionary is a crowdsourced online dictionary for slang words and phrases, operating under the motto "Define Your World." The website was founded in 1999 by Aaron Peckham. mug front
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operating system 

A combiniation of command interpreters which runs between the central processing unit and software that allow a users to interact with a computer or other electronic device. A phrase that can never refer to any Microsoft product. By its very definition, an operating system must operate, which is the complete opposite of any Microsoft product.
Linux, FreeDOS, DRDOS, BEOS, Unix, OS/400, are all operating systems.
operating system by Kyle December 23, 2003
Willfully consume quantities of non-healthy food while knowingly gaining weight and not giving a fuck.
- Whatchadoin?

- Just obesing my third pizza.
obesing by primalr April 23, 2017

Operating heavy machinery 

I’m gonna be operating heavy machinery to night.

Idar Oberstein 

City in Hunsruck area of Germany. Known as the gem capital of Germany
I bought the biggest diamond in Idar Oberstein.
Idar Oberstein by nick digger September 28, 2011

OSI (Operating System Index) 

OSI (Operating System Index) A method to determine the level of geekiness or nerdom in an individual using the number of operating systems they use.
Larry: Lewis has so many damn computer gadgets.
Bill: I know, right? What's his OSI (Operating System Index) then?
Larry: 6