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flat-chested 

having little or no female breast development
She was known in high school as "some flat-chested girl."
flat-chested by Light Joker May 30, 2006

flat chested 

some one who is a part of the "ITTY BITTY TITTY COMITTIY"
in other words, very small breasts.
boobless.
flat chested by Josh O August 18, 2004

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.

flat-chested 

did you see that flat-chested girl?
flat-chested by tim March 13, 2003

flat-chested 

A girl with absolutely no boobs who often likes to pack her bra to make it seem different
flat-chested by Martin Lawrence March 19, 2004

Flat chested 

A girl with no boobs. It’s pretty bad when her ribcage sticks out farther than her boobs.
Mackenzie is REALLY flat chested man. #notits
Flat chested by basicbitchxo August 25, 2019