1 definition by Sexy Lexi

Top Definition
The awkward amount of breast protruding from beneath a bikini top. It is debatably sexy, but it is def a spring break must.
Wow, That girl on sweet 16 has the under boob thing going on..

Poor Nicole Ritchie, she doesn't have enough body fat to pull off the under boob.
by Sexy Lexi April 14, 2006

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