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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?
BFOS by Ashbuscus. November 19, 2017
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.
BFOS by Freak out girl October 12, 2009
Boys From Other Schools.
Pronounced "Beef-Ohs". A term referring to hot boys or fresh meat from another school or zip code. Typical verbiage used around an event incompasing a variety of attractive people from different locations.
Tina: Rumor has it this party's gonna be packed with BFOS.
Bob: What are BFOS?
Tina: B.F.O.S....Boys From Other Schools
Linda: Whats wrong with the boys from your school?
Tina: I need fresh faces...and fresh butts.
Gene: You'll take the butts you're given and you'll like it!
BFOS by Rain Darian Skye June 28, 2017
Boys from other schools or boys from other states.
Bobs Burgers reference from Mazel-Tina S4 E13.
Take a look at those BFOS!
Yea they are really hot. :P
BFOS by hgcjzkujsxhkjz August 7, 2022