A psychic wind or breeze describes the rush of cold air when a spirit or ghost is present. They are a common phenomena in spiritual circles and anyone who has been on a ghost hunt will be familiar with the term. However it could apply in different circumstances such as a psychic or medium who is simply full of their own hot air. I'm not naming names but I know of several who love to blow their own trumpets about their experiences, their knowledge, how great they are, how accurate and so on.
Remember though that just because someone is in the public eye it doesn't always mean that they are a great medium or psychic, it makes them lucky or good at promoting themselves.
Some of the best mediums and psychics are still to be found in spiritualist churches the length and breadth of the UK and their messages are free of charge.