What does fanny mean in Britain?

Fanny in Britain is a colloquial and informal term used to refer to a woman's buttocks or backside. It is considered a casual and sometimes vulgar expression, and its usage may depend on the context and social setting. In most cases, it's used in a lighthearted or humorous manner rather than in a formal or serious context. It's worth noting that the term can be perceived as offensive in some situations, so it's generally advised to use it with caution.