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Bra Knowledge » Quad boob » Versions » Quad boob as of 2016-01-10 01:33:24.718909

Quad boob is the phenomenon seen when your breasts overflow the bra cups and makes it look like you had 4 bulges on your chest, thus the quad.

Each breast overflows the cup from above the cup creating an additional mound. It is usually more noticeable when wearing snug clothes on the chest.