What exactly is guru meditation?

Guru meditations. A guru is a person who is considered to have great knowledge, wisdom and authority. Meditations are thought process of the mind to bring about a relaxation response and deep thought. Usually quiet contemplation of the breathing or chanting of a mantra. The purpose is to achieve inner peace and tranquility.
Thought-relaxation. If you check google, it's like the "blue screen of death" when using certain operating systems. That aside, "guru" is the term for a teacher or master, and meditation is simply defined as to spending time in quiet thought for religious purposes or relaxation. The meditations to consider these days is within the practice of mindfulness, which is easily learned and applied, and remarkably effective.