stands for Blowjob From Friend and usually used by people who's so close and sending weird texts like "ILY" which means I Lick Youngsters. Beware of these predators because they could even seduce you to be their next target.
*two people chatting to each other*
one person: bro i got a BFF!
other person: ayo you are very lucky!! i need a BFF too.
a lie. there is no such thing as having a BFF because eventually you will just stab each other in the back one too many times and it will be over forever.
the person you think is your best friend. if you're lucky enough to think you have one at the moment.
someone who is not worth crying over but you always do anyway
Person1: My so-called BFF just stole my guy/girl and now shes/hes pissed at me for no reason!