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2. underboob
Hands down, one of the finest aspects of a woman's anatomy that can be enjoyed in any public venue.

Underboob is achieved by wearing a very short halter top or cropped tank, also known as an underboob shirt, which exposes the bottom areas of a woman's breasts.

Much like the combination of low-rise jeans and a thong, the underboob shirt can only successfully be worn by select few women.
In an ideal situation, a hottie will wear an underboob shirt to accessorize her low-rise jeans/thong combination. When this happens, all men in the vicinity will regard her as "hot" or "a sexy bitch", while their wives/girlfriend may refer to her as "trashy" or "a slutty bitch", but that's okay. Everyone knows she's a sexy bitch and they all want to do her.
by X. Phoratus Feb 21, 2005 add a video
1. underboob
October 17, 2009 Urban Word of the Day
cleavage visible from the part of the shirt that covers the bottom of the female breasts
If that is not a deliberate underboob, I don't know what is.
3. underboob
Underboob: The only time in life when gravity is your friend.
"She's got underboob, so there's a small chance her boobs will slip out of her top, thanks to our good friend GRAVITY"
4. underboob
better than cleavage.
I love underboob.
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