Top Definition
Better Fucking Fuck Off.
Used similar to BFF (Best Friend Forever), but used for someone who you really can't stand.
Me: Isn't that your BFF Jamie? I know you just LOVE working with her.

Co-worker: Hell no. More like my BFFO. I never want to see her again.
by PsychicNinja August 21, 2010
Best friend forever.. on sundays
Since we only talk on sundays we're BFFOS.
by MeLlamosFelix March 27, 2008
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