Flat Chest Syndrome 

Flat Chest Syndrome or Blanc Syndrome is when a girl thinks the fact that her chest is flat makes her unwanted and so becomes an ill-tempered Tsundere.

May: I think has Erika Flat Chest Syndrome.

Flat Chest Syndrome by I'm Balls Deep in your mom January 5, 2022

Flat Chest Syndrome(FCS)

A phrase/ mental disorder which discribes the social immaturity displayed by women(ages 14-19) with flat chest. It's usually diagnosed by a friend or first time aqaintance who notices certain idiosynchrasies that display annoyance, or in gereral over compensation.

Victims of FCS often display narcissism, or self-centeredness; They often try to compensate by trying to be intellectually superior or catty.

It's often grown out of but the long term effects can only heal with time.

Abel- Dude (girl) is being so annoying
Chelsea- Yeah I know she must have Flat Chest Syndrome(FCS)
Abel- Oh yeah she's deffanently FCS positive.

Flat Chest Syndrome(FCS) by Chabel Roeschstraviz March 26, 2008