Girls with tight bodies, usually with hot curves e.g. Melanie Iglesias but with "bigger" or above-average sized natural breasts e.g. Kelly Brook/ Lacey Banghard
"Damn n*gga! we got those B.C.G.'s up in here!!"
Girl1: I really should not run down the stairs with these things, ouch!
Girl2: Oh poor you and your B.C.G problems!
Boy: God bless that chest!!