- Flat Chested; a girl with pretty much no tits at all, not just tiny tits but the absence of tits.
Flat chested is a pretty wide ranging term in a sense. For lovers of girls with big tits, anything under a B cup is flat chested. For lovers of girls with tiny tits and small breasts, flat chested is a term really reserved for the girls in the AA to very small A cup chest size. As porn has shifted away somewhat from the busty pornstar look with big fake boobies and such and more onto natural girls, we have seen more flatties and tiny titty girls going hardcore.
As an example, Kacey Jordan is pretty much flat chested.