Top definition
1. When only the bottom of a woman's breasts are exposed. 2. When a woman is wearing a shirt that comes "UP" to the center of her nipples. 3. Also know and Bottom-Breasts. (Down-Shirt cleavage does not count as Nipple Cleavage.
I saw a MILF at the beach that was showing so much Nipple Cleavage, that I almost passed out!
by the2ndflood February 20, 2008
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The vengeful act of crapping on a lover's chest while they sleep.

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