Peckham commenced writing the first Urban Dictionary book around the start of 2004, and continued for a year and-a-half before it was complete.

Urban Dictionary evolved to what it is today because people used it for their own purpose -- self-expression.

My job is to support that use, and that's why I'm participating in this lawsuit.

" Custom Urban Dictionary merchandise, including mugs, magnets and mouse pads, was introduced to the site's store in 2009.

The custom products built upon the print editions and a desk calendar that was first sold around 2007.

People write really witty definitions, and they aren’t taking it very seriously ...

I feel like that’s what distinguishes Urban Dictionary from other dictionaries and Wikipedia.

During the "Internet Underground" panel of the 2011 ROFLCon Summit, Peckham explained that, as a computer science student, his primary motivation was to construct a website; but he was also dissatisfied with the conventional English-language dictionary, as it "was telling us how English was spoken, instead of reflecting how English was actually spoken." For the launch of Urban Dictionary, Peckham installed the website on a File Maker Pro web server that was operated from under his dormitory room bed at Cal Poly.

Peckham paid more attention to the site after a news article revealed that United Kingdom (UK) high court judges had used Urban Dictionary to assist them in a case involving two rappers (the judges unsuccessfully attempted to comprehend slang language that the rappers used).

Over a 30-day period in March and April 2011, 67,000 people wrote 76,000 new definitions for Urban Dictionary, while 3,500 volunteer editors were registered.

In an April 2011 Guardian article titled "In praise of urban dictionaries", Peckham revealed an overview of 10 rules that he had devised for the site's content: "Publish celebrity names, but reject 'real life' names.

At the start of 2014, the dictionary featured over seven million definitions, while 2,000 new daily entries were being added.