FBS 

Abbreviation for "fucking be serious". Used to denote either that it is now time to become serious or that something is meant to be taken literally.

1: Okay, FBS, we really have to get this shit done. No more messing around.

2: Like, FBS, we're in love.

FBS by shiksadulcinea August 16, 2008

FBS 

Facebook Spy
An individual that stalks people on facebook. Or noses about on peoples facebook pages, to gossip about it.

I was on some FBS tip, and found out she's pregnant!

FBS by Ja'e June 25, 2010

FBS 

Known as Fucking Bitch Syndrome. A women who hates on another women. In order to feel better about herself or to get the attention of men.

"She was talking shit about you getting that job? Sounds like a case of FBS".

FBS by SheGone December 19, 2014

FBS 

Fuck Boy Syndrom

Fuck Boy Syndrom (FBS) is typically gotten by those who like many girls at once and have early dementia.

FBS by ------389 February 24, 2018

FBS 

FBS is a shortened way of saying fat bit*h syndrome

Oh my god she definitely has FBS look at her

FBS by Ethan Gillespie July 19, 2020

FBS 

Full Body Selfie

Her: hey we should hang out, btw I’m a little chubby.
Him: Yeah I’m down to hang, and yeah no worries I don’t discriminate but FBS?

FBS by Duhduhduuuuhh December 22, 2020

FBS 

Stands for Fake BPM Syndrome. People that have FBS often think the BPM of a song is much higher than it is. It's especially prominent with people that are often not used to songs higher than 180 BPM and in Camellia's comment section on YouTube.

1: OMG this song is so fast!! It's like 1000000 BPM!!!!
2: dude this song is 205 bpm, i'm taking you to the doctor
Doctor: I'm sorry 1, but you've been diagnosed with FBS.

FBS by FyterX June 3, 2021