What does fracking mean and is it a good thing or a bad thing to use

It can mean two things either the process of injecting liquid at high pressure into subterranean rocks, boreholes, etc., so as to force open existing fissures and extract oil or gas or it could be used for emphasis or to express annoyance, frustration, impatience, or surprise: "are you out of your fracking mind?"

Depends on the way you use it.