Some person on Facebook who has been leaving a lot of comments on your posts. However this is a person who you never hang out with in real life. Therefore he/she is a Best Facebook Friend For Right Now.
Yo, whose this girl blowing you up on Facebook recently?
Abbreviation for best friendly, ferocious, fluffy, funny, fantastic, fun, floppy, fast, fat, flavorful, friend forever. When calling him/her a best friend just isn't enough!
Bob: Yo, she's too amazing to be my bff Joe: What is she gonna be then?
Bob: She's going to be my bfffffffffff !!!
Joe: lol