Best Friend of the Office; Your best friend at work whom you normally would not be friends with outside of work; A BFF, but only at work.
Lisa: "Hey Marlon, are you going to hang out with Jeff on Thursday night?"

Marlon: "Hell no, he is just my BFO. We don't hang out outside of work."
by LisaBisa28 April 14, 2009
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BFO: Brazilian Food Orgy.

Lunch or Dinner commonly consumed in Southern Brazil, in the form of an unlimited, obesity-inducing buffet of orgasmic proportions, eaten regularly (aka every day).
"Hey Luan, I really feel like gorging my face with food."
"We should head down to the BFO down the street then."
"Which one? There's ten of them on this street."
by djwanker October 2, 2014
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Back the Fuck Off

A socially acceptable/reasonably polite acronym a guy or girl can either text, message, or say to a person that persistently hits on them without a clue as to how disinterested they are.
Nah, girl. I told him to BFO, so I'm done with that shit.
by IUarileya January 11, 2011
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"BFO" or "Blinding Flash of the Obvious" is when you suddenly realize how absurdly simple the answer to a problem or situation is.
I just had a "BFO", I am a Geek!!!
by Dale Sanford January 12, 2006
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Did you see that BFO? Man I almost run into that BFO. Anything bigger then a car
by RangerNii March 25, 2010
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"Boob Falling Out"
When your boobs are falling out of your shirt or dress
Jane needs to pull up her shirt she has a BFO!
by Thisismyusername111 August 3, 2010
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