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!
Hells yeah! Ask her to reach for something off the top shelf!
by X. Phoratus February 21, 2005
Get the underboob shirtmug.