London slang is the language used by people in London, the capital city of England. It's often made up of words that are influenced by different cultures and languages. For example, "mate" is a word that comes from Australian English and is used in London; "bling" is a word that comes from Jamaican English and is also used in London. The words used for London slang often change over time and may be different in different parts of London. London slang is often seen as unique and is a feature of the city's culture.