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1.
a woman with small, but nice breasts
Girl, unbutton that shirt and let me get a peak of them hidden hills
by d-nizzle July 12, 2006
 
2.
A girl whose tits look small when wearing a loose shirt (such as a polo shirt), but are actually larger than they seem.
Damn, I thought her tits were small when she had that uniform on, but when I saw her in a bikini I realized she had hidden hills!
by Doctor Swiing August 24, 2007