fluorocarbons is a general name for a class widely industrial solvent which is also sometimes referred to as perfluorocarbons
Flurocarbons react with ozone and deplete it. It causes various adverse effects.
They react with ozone. Decompose it and form a chain reaction.
Fluorocarbons contain the element fluorine. It participates in reacting with ozone and depleting it.
Carbon based compounds which contain fluoride. By far the most commonly known fluorocarbons are the chlorofluorocarbons - CFCs - that were implicated in the degradation of the ozone layer.
oxygenated fluorocarbons are indeed real and experiments have shown that you can place a mouse in it and it will stay alive however it is not easy to get the fluid out of the lungs afterwards. As a result it is not used for humans in scuba diving in the way it has been portrayed in things like the film; the Abyss. For one thing it would be hard to fill all of the gas pockets in the body, such as the sinuses and pressure on the body would also effect how various physical processes take place. These would probably limit the depth a diver could achieve even if oxygenated flurocarbons were used.
You can find fluorine in toothpaste and in some city water supplies, because fluorine strengthens teeth and helps prevent tooth decay. It does not affect the taste, scent, or appearance of water, however. You can't find pure fluorine anywhere (well, other than from a specialty gas supplier), because it's too reactive to exist in nature. It reacts explosively with carbon and hydrocarbons, as the first person to try to make flurocarbons found out (he lost two labs that way).