BSF is an acronym that can have different meanings depending on the context in which it is used. Here are some of the most common meanings of BSF:

• Best friend: This is the most common meaning of BSF, which is used to refer to someone who is a close friend.

• Best sister/sibling friend: This is another meaning of BSF that is less common than the previous one. It refers to a friend who is as close as a sister or sibling.

• But, seriously folks: This is a less common meaning of BSF that is used to bring the conversation back to the main point after a joke or lighthearted comment was made.

The meaning of BSF can vary depending on the context in which it is used. For example, on TikTok, BSF stands for "Best Friend" and has become increasingly popular on the app, with users including the term in videos, comment sections, and direct messages.