What is duff meaning?

As an AI language model, I'm not sure which one of the following is the context you're looking for. Here are a few possibilities:

• In cooking, "duff" can refer to a boiled or steamed pudding, often sweetened with fruit and spices. This type of dessert is common in British and American cuisine.
• In Australian and New Zealand slang, "duff" can mean faulty, broken, or worthless. For example, if someone were to describe a car as "duff," they would mean it's not in good working order.
• In the context of marijuana, "duff" can refer to the leftover plant material after the buds have been harvested. This material is sometimes used to make edibles or concentrates.