flat-chested 

When a girl's chest is flatter than a board of wood

Damn, that girl is flat-chested!!!

flat-chested by The Reaper of Life September 17, 2018

morbidly flat chested

A girl that is so flat chested that she is often mistaken for a guy.

Hey bro, was that guy hitting on you? That wasn't a guy. That was Sara, she's morbidly flat chested.

morbidly flat chested by Big Pappa 4487 October 11, 2015

flatchested 

the name for a person with a very flat chest. usually very offending to most girls who have no boobs.

A: ew. look at that tiffany girls myspace picture.
B: i know. no one wannts to see her in a bathing suit.
A: and shes pressing her arms together ro make it look like she has boobs.
A: she is so flatchested.

flatchested by Alexa H August 24, 2006