BFF stands for Best Friends Forever, a popular acronym used within the younger generation to describe their closest friends. However, there are a variety of synonyms used for the term BFF. Some people use the term "ride or die" to describe their closest companions. Others may refer to their best friends as "soulmates" or "partners in crime." Additionally, some people use the term "kindred spirits" to describe their closest friends, while others may use "bffls" or "best friends for life" as a way to show the depth of their connection. Overall, whatever synonym you choose to use, it's clear that having a best friend is an important and treasured experience for many people.