Jay-Z is a G (high quality lyricism, money, Beyonce, style, class etc.).
2. A unit of force equal to the force exerted by gravity; used to indicate the force to which a body is subjected when it is accelerated.
2. Therefore acceleration of gravity:
n. (Abbr. G)
The acceleration of freely falling bodies under the influence of terrestrial gravity, equal to approximately 9.81 meters (32 feet) per second per second.