In chat and online slang, the most common full form of BSF is Best Friend.
This acronym is widely used on social media, instant messaging apps, and online forums to refer to a close and cherished friend. While less common, BSF can sometimes stand for "Best Sister Friend," emphasizing a friendship that is as close and supportive as a sibling relationship.
Essentially, BSF signifies a strong bond of friendship and affection between individuals.
