Top Definition
A current close friend of yours. You and them have an understanding that this relationship will go on to and beyond the end of your lives, but we all know that it won't last longer than a year. Then you will need to get a new def bff forev.
"Oh I thought you hated Ally?"
"Hell no!!! She's my def bff forev, dude!"
by Chrisp February 23, 2005

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