A breast that has had about 5 or more breast implants that it is so imbeded with Silicon, it is virtualy indestructable.
In fact, it can, and sometimes even is used as a pot holder for pots or pans that are too hot for bare hands.
In some cases the breast is even amputated and places in bulletproof vests, for protection.
"Did you see Nicole Smith this month, dude?"
"This is her 5th implant, her tities are not Yabos of Steel !"