Going Out
To embark on a surf session.

Golden Fool
Description of a breaking waves curl just before sunset when the weaning sun casts a golden hue on it.

Goodman, Benny
Big Band Leader, circa 1940s, whose composition; "They Call it the Jersey Bounce.", became the anthem for "bouncing" summer transients to their respective origins; hence, Bennies.

Goofyfoot
A surfer who surfs right foot forward and faces the wave on lefts, and doesn't face the wave on rights.

Goons
Locals that rule their turf with an iron hand. On land and in the lineup.

Gouge
Sharp and fast turn. Damage to a surfboard from reef, rock, etc.

Great Circle
The shortest distance between two points on a curved or spherical surface like the Earth, which is actually a curved line when projected on a flat surface like on a Mercator chart. These lines are called Great Circles. Swells travel in Great Circles around the Earth. As an example, if you take a string and extend it between two points on a globe, you can see a good representation of a Great Circle.

Green Room
The vortex or location on the wave face where the surfer is covered by the pitching lip.

Gremmy
A good surfer who can rip but really has no idea what he's doing.

Grind/Grindage 
Food is known as 'grindage'. To eat is to grind.

Grom or Grommet 
A young surfer generally less than 16 years of age.

Grom Board
An extremely short, shortboard. Owned by a grommet with extreme surfing capabilities. The board is usually around four and a half to five foot in length and wafer thin.

Grom Slalom 
A skiing technique applied to surfing where a longboarder avoids hitting the Groms sitting on the inside waiting for wave scraps.

Groundswell
A swell with a swell period over 11 seconds between successive waves. As a rule, the harder the wind blows in a storm, and the longer it blows over a longer distance of ocean, the bigger the swell will be and the longer the swell period will be between successive waves. The longer the swell period, the deeper the swell energy extends below the ocean surface, which interacts more with the ocean floor, or the "ground" so to speak. This is contrary to a windswell, which has a shorter swell period, and is always generated by local winds with brief duration and over a limited distance of ocean. Groundswells with longer swell periods can wrap (refract) greatly into many spots due to deeper interaction with the ocean floor compared to shorter period wind swells.

Group Velocity
The forward speed of a swell, or wave group. In deep water, it is equal to 1.5 times the swell period between successive waves in the wave group. The waves within the wave group move twice as fast as the overall wave group at 3 times the swell period. If a swell or wave group has a swell period of 20 seconds, the individual waves will be moving at 60 knots, while the group as a whole will be moving forward at 30 knots. As each wave moves forward within the wave group and reaches the front of the group, it will fall back to the rear and repeat the cycle.

Grum Bones
Name given to all the local wildlife at your surf spot. If you were to spot a seal, his name would instantly become "Grum Bones".

Grub
Food reference one might say after a long day of surfing.

Gun
A special surfboard designed to ride big waves. Generally longer than normal surfboards so the surfer can paddle faster to catch the bigger, faster moving waves, with a pulled-in tail to handle the high speeds.

Gunned
Reference to the size of your board needed in relation to wave conditions. Being "under gunned" is when conditions are too big for the type of board you're riding.

Gusset
The panel that runs down the arm, invented to make paddling easier.

Gutter
A channel that forms in between or on the side of the surf peak or break setup.