WBFFL is an acronym for "worst best friend for life". It is when two people say they cant imagine not being in each others life but, then one finds out the other never actually meant any of it at all. So they are in turn your worst best friend for life because you will never forget them even though you neverreally knew them at all.
"worst best friend for life"... which represents someone who always knew how to make you laugh when you did not want to. Is someone who could make the world disappear with one look. And is someone who you will never have again. So the feeling is the worst because you knew they were the best.And you know you will remember them always.