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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."
by Sir Benjamin Tennyson May 27, 2016
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2
A woman with a flat or small chest.
Man, have you seen that skinny chick in accounting? She's a total chestlet.
by Memelord July 18, 2016
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