Urban Dictionary - Urban Dictionary is a Web-based dictionary of slang words and phrases.
Forvo - Forvo: the largest word pronunciation dictionary in the world, now with translations.
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.
Howjsay - Pronounce words correctly with the world’s largest English pronouncing dictionary.
The Online Slang Dictionary - Learn thousands of real slang words or add your own.
Shtooka - The Shtooka Project is a multilingual database of audio recordings of words and sentences.