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The breasts on some women (usually cute little butchy boy-lookin women) that can easily be mistaken as not having the distinct characteristics of a woman's breast. Only at the right angle can the viewer tell that the woman is a woman.
Ethan: "Hey Indy, is that a boy or girl over there with the purple hair?"

Indigo: "That's a tough one, but...oh check out the hide-a-boobs. I caught em at the right angle. Its a girl."
by Ethan Twiford October 10, 2013
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