refers to the husband or wife of your best friend forever bff. Because bffs are basically family, there should be an easy reference for their spouses. this may be gender-sensitive as more women tend to use bff than men, but can still be used to refer to a female spouse of your male bff.
I can't wait for my bff, Adina, to marry Adam. he'll be the best bff-in-law ever.
by munmunword March 17, 2013