The internet describes it as: “phenomena that appear to contradict physical laws and suggest the possibility of causation by mental processes.” or “phenomena lying outside the sphere of physical science or knowledge.”
So, in layman’s terms, psychic phenomena are abilities and/or practises that do not comply with known laws of physics and deal with the metaphysical.
*Metaphysics is “a branch of philosophy that deals with the first principles of things, including abstract concepts such as being, knowing, identity, time, and space.”