A woman who has had so many procedures done on their Boobs, lips, ass, and cheeks they look like a blow fish. Usually women who do porn or are over the age of 50 and aren't hot anymore.
The term "Plastic Bimbo" can also be used.
Person 1: OMG is that Julie?
Person 2: No, that's a Blowfish
Person 1: What's the difference?