Noun.

1. In art, a singular curve/line/lump of breast used to represent two boobs under clothing.

2. A single mass/breast where two should be, but not where two were originally (if you loose one boob, its not technically a uniboob). A uniboob is the presence of an original single boob.
I was in a rush, so I gave the women in my drawing uniboobs.
by Arthoes December 22, 2007
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When a female wears a top or undergarment that makes her breasts come together to look like one large breast.
Oh my gosh, that tube top totally gives her a uniboob!
by ScrapperMomx3 March 8, 2013
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An insulting adjective to describe a female who when the mathematical appreciation of her breasts (the summation of the volume of both) is barely enough to fill a small cup size.
Erin is a uniboob. She has to wear a negative cup size or her bra backwards to appear normal.
by SoYouWantToHaveThisArgument March 18, 2009
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Derogatory term.

A woman with only one breast due to congenital defect or mastectomy (breast surgically removed).
Jane's uniboob is the cause of her depression.
by Blowfish July 24, 2005
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when you zip up your sweatshirt all the way and you get that bump of sweatshirt that just so happens to be right where your boobs would be.
''I always hate it when i get a uniboob.''
by just plain awesome October 17, 2009
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What happens when white trash whores don't have money to pay for Playboy boobs at Boob R Us, but still want to have big tit (notice the lack of 'ties')
Dumb bitch wants them fake ass playmate titties, but couldn't pay for it, so she got a uniboob.
by Stoner May 24, 2003
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