Actually, Urban dictionary does define it nicely... "The cleavage seen when a women is wearing a very high cut top. Basically, the tops of the breasts will be covered but from about an inch below the nipples and down will be bare." Or, simply, underboob.

You'd think I'd be ready after TEN years training...

At least with those on, we don't have to hear how he had to HUNT his food back in his day, after walking uphill both ways, through the snow and barefoot, blah blah blah...

One of my favorite angles...

MUST...OWN...THIS...SIGN