A "Slang Dictionary" is a reference book or online resource that provides definitions and explanations of slang words and phrases. Slang refers to informal language that is often specific to particular groups, regions, or cultures. These dictionaries help users understand contemporary language trends and the meanings behind colloquial expressions. Slang dictionaries can be useful for various audiences, including language learners, writers, and anyone interested in modern communication. They often include examples of usage, origins of terms, and notes on regional variations, making them valuable tools for grasping the nuances of language and culture.