American English Slang consists of words and phrases we use in the United States in informal situations. Slang often changes, and it is dictated by culture, region, class, etc. So while idioms may be formal or informal, slang is always informal and changes more often than idioms do. You may choose to use slang around friends or family, but you wouldn't necessarily use slang around your boss or teacher!
While some American English slang terms are harmless and won't offend anyone, other slang words and phrases may be offensive. Since children and adults access this website, I will respectfully exclude moderately offensive slang.
Practicing slang and idioms can make you sound more fluent and also improve your listening skills. Students wishing to practice slang, idioms, conversation and pronunciation, or grammar and writing, should sign up for a Free Class.
First I list the slang:
Then the definition.
Lastly an example.
Click a letter to see slang that begins with it.