Top Definition
By adding the suffix "est" to BFF you acknowlege that one person is your bestest bestest friend forever.

The suffix is derived from the adjective-chain big, bigger, biggest. Increasing in size until it can increased no further. This gives a new chain of BFF, BFF-er, BFF-est.
Julia, you are my BFF-est ever.
by ButterMN February 25, 2008
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