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."