British slang is like a secret language that people use in informal or casual situations. It’s made up of words or phrases that might not be in regular dictionaries, and it changes a lot depending on where you are and who you’re talking to.
It’s kind of like a cool, fun way of talking that gives a group of people something special to share. Sometimes, British slang words can mean something different from what you’d find in a regular dictionary, and they can help you fit in and feel like you belong when you’re talking to others who use the same slang.