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The gap between a tight fitting shirt and a woman's breasts seen from the side. This is the most sexual type of cleavage and should never be overlooked.
Boy 1: Yo dude, see that chick over there?

Boy 2: The masculasian?

Boy 1: No way man, the other one.

Boy 2: The one with the sexy gap between her boobs

and shirt?

Boy 1: Basically, that's Over Boob Cleavage.

Boy 2: Shit son! That's the sexiest thing ever.
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