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Stands for Best Friend Out of Spite- Someone a person claims/pretends someone is their best friend when in reality their real best friend hasn't hung out with them as much as they used to and they're trying to make them jealous.
Friend 1: You're my best friend!

Friend 2: But I thought James was your best friend. You've known him your whole life. You've only known me for a week.
Friend 1: James used to be my best friend but he's not hanging out with me anymore, so you're my best friend now! Besides, he's stupid.
Friend 2: I'm just a BFOS, aren't I?
by Ashbuscus. November 18, 2017
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8
B.F.O. is a acronym for ‘BIG FUCKING ONION’ describing the size of the Northwest onions compared to the east coast onions.
I'm making Corn Chowder and I'm not sure if it needs this much onion... I mean, this is a B.F.O.
by spoken_deity September 04, 2008
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9
"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 11, 2006
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10
Did you see that BFO? Man I almost run into that BFO. Anything bigger then a car
by RangerNii March 24, 2010
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12
"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 02, 2010
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13
Acronym for Boyfriend Freak Out Syndrome.

When you like someone, get to know them then freakout, run away (or hide yourself in the toilet), and/or do something stupid to sabotage your chances with a guy you like. Usually at a point when it is most important in getting a date, etc.
Friend: Why did you run into the toilet just as that guy was going to talk to you?

You: I dont know I guess BFOS got ahold of me.
by Freak out girl October 12, 2009
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