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1.
Soul Best Friends Forever - only for those with true SBFFness. Not everyone can handle the impact of being an SBFF. What affects one always affects the other
Goose and JayDubb are SBFFs for life.

Don't mess with my SBFF!
by Mom Dubb September 27, 2008
 
2.
Second Best Friend Forever
Daina may be your BFF, but I'm your SBFF
by Jimbolaius June 06, 2011
 
3.
Secret Best Friend Forever
Hey, I didn't realize you two were friends.

- Nobody does. We're SBFF. -
by Okstopyelling July 11, 2014