Top Definition
Any short shirt, such as a halter top, cropped tank or baby tee, that rides so high on a woman's chest as to expose not just the midriff, but also the bottom area of a woman's bust.
Damn, did you see her new underboob shirt?

Hells yeah! Ask her to reach for something off the top shelf!
by X. Phoratus February 21, 2005
1 Word related to underboob shirt

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