Urban Dictionary - Urban Dictionary is a Web-based dictionary of slang words and phrases.
Dictionary.com - Dictionary.com is the world’s leading digital dictionary. We provide millions of English definitions, spellings, audio pronunciations, example sentences, and word origins.
SlangLang - SlangLang is an editorial dictionary for slang words mainly used on the internet. Here you will find definitions and information about the origin and spread of terms, memes and emotes that are used on the net.
ManyThings.org - ManyThings is a multiplatform and user friendly application for students of ESL or EFL to learn the meanings and definitions of different terms and phrases.
The Online Slang Dictionary - Learn thousands of real slang words or add your own.
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.