This document discusses slang and idioms in English. It defines slang as informal language used especially within social groups that can change quickly. Examples of slang used as verbs and adjectives are provided. Idioms are phrases with figurative meanings that are grammatically unusual, like "long time, no see". The best ways to learn slang and idioms are through direct contact with native English speakers via videos, TV, music, and social media, as well as websites dedicated to defining slang terms.