Urban Dictionary - Urban Dictionary is a Web-based dictionary of slang words and phrases.
The Online Slang Dictionary - Learn thousands of real slang words or add your own.
Wedefine - Wedefine is an open source dictionary site that you can self host
Hinglish Dictionary - HinglishDictionary.com is an archive of user submitted Hinglish words. Users can register and create accounts and add new words, that must have a touch of Hinglish language in it.
SlangSite.com - SlangSite.
Slang-Dictionary.org - Slang-Dictionary is a web-based database for searching through the database of slang words and learn how different words are getting different meanings in different countries of the world.