Gandelf
An older experienced surfer who is "wise in the ways of the wave."

Gangbuster 
South Bay for a heavy / big wave or set of waves that are so big they threaten to take out the lineup.

Gash
Very sharp turn or a gnarly, deep cut.

Gaskets
Three areas on a suit-wrist, ankle and neck-where the rubber is rolled inwards to create a fairly inflexible seal, which inhibits water seepage. The neck in particular is a delicate balance between flexibility and tightness, seepage and breathing. Some companies no longer use gaskets, relying instead on form-fitting rubber.

Geek
Someone who's barely able to surf and lacks the ability to maintain the calm, cool and collected demeanor when describing their ride.

Geeked
(see hotcoat)

Gelcoat
A final coat of thin, hard resin applied to surfboards in order to bring up a slick, shiny uniform surface for finishing.

Gidget
Originally coined to indicate a female surfer of diminutive stature. Syllabic combination of Girl and Midget; Gidget.

Glass Axe 
The lip of the wave...generally used to describe the feeling of getting hit by the lip of a gnarly bomb.

Glass Job
The protective fiberglass and resin coating applied over the foam of a surfboard.

Glass-off
Condition when the water is as smooth as glass.

Glasser
A person who is employed to laminate surfboards using resins and fiberglass (thus the name).

Glassy
A windless surf condition in which the texture of the ocean surface is ultra-smooth, like glass.

Glide
A spiritual place when everything seems to be in synch...the wave, the surfer and the board are one entity. When a surfer achieves this he's said to have the...glide.

Glosscoat
A final coat of thin, hard resin applied to many surfboards in order to bring up a slick shiny surface.

Glory Trail
The same act as prone out, but this is usually accompanied by hoots and hollers from the waiting crowd that just witnessed a surfer ride a wave exceptionally well that caused ancillary stoke to occur.

GMT 
Grenwich Meridian Time. Greenwich Meridian is located at 0 degrees longitude, over a town named Greenwich in England. GMT is World Time and the basis of every time zone in the world. It is fixed all year and does not switch to daylight savings time. All other time zones have a GMT correction to determine local time. For Standard time, New York is minus 5 hours from GMT, and California is minus 8 hours. So if GMT were 1200, California would be 0400 Pacific Standard Time. GMT is also sometimes called Zulu Time, especially on weather charts which may display 12Z for 1200 GMT (Noon), or 00Z for 0000 GMT (Midnight).

Gnar
Depicting an unrideable or intimidating wave or something really bad.

Gnarly
Heavy, intense waves or situations. Often overused.

Gnar-Max
Something that is gnarly to the maximum...or can't get any cooler.

Gnarman
Something that is gnarly and can't get any more lame.

Going off
When the surf is very good and firing or pumping. Also refers to a surfer who is surfing particularly well, i.e., "Kelly Slater's going off."

Goatboat 
Surf ski; generally ridden by older men in the grip of a mid-life crisis. Usually in the way and tend to drop in.