Best Friends Forever is the Full form of BFF . It is a term that refers to a close connection that is marked by trust and loyalty. Best Friends Forever (BFF) relationships are prevalent among middle and high school teens and youngsters. This acronym is often used in chat rooms on social media sites such as Facebook, WhatsApp, and Instagram. The acronym "BFF" was introduced to the New Oxford American Dictionary on September 16, 2010. The acronym BFF first emerged in 1996, according to the dictionary.