A female, typically one with
small breasts. (Often used in a
negative context.)
Males may be called chestlets as an insult, much like calling a male a "
little girl". (Also, may be a more demeaning insult than "manlet".)
"I
don't see how anyone can like chestlets,
more meat on a woman is better!"
"
Shut up, you chestlet."
"Forget that slag, she's a chestlet anyway, not worth your time."